I talked with some people who were disappointed with the Night King story so here's a quick re-write/revision of season 8 - which should actually stretch for several more seasons. By the way, this is a parody so don't take it too seriously. All use of copyright is fair use as parody.
Atrollahai - The Prince Was No One - Season 8 Re-Write
Season 8
First of, the battle between the living and the dead will be a lot different. Melisandre won't be present. The Night King won't attack personally but rather direct his armies from the north telepathically. Equally Bran will know this won't try to use himself as bait. He will warg into Viserion instead but the battle will be lost anyway as White Walkers simply raise more dead to replenish their army. Viserion is ultimately destroyed.
The battle ends with pretty much the same casualties as before except Theon who survives for now and continues to act as Bran's bodyguard. They are all forced to flee as the dragons cover the back. News of the their defeat quickly reaches Cersei and she is now worried. The Long Night has also come, the sun no longer shines in Westeros, the dead march on.
Lady Melisandre resurfaces in King's Landing to warn Cersei that "humanity is in peril", that the "night is dark and full of terror" and that her only hope now is to take her people and travel east, to the lands of Asshai in Essos. Cersei is too proud to give up the Iron Throne and will hear none of it and send her away. Melisandre remarks "I've failed humanity before, I will not do so again" as she is escorted out by the Mountain and the other guards, later Qyburn quietly defects when everyone is asleep, knowing first hand the power the dead have after resurrecting the Mountain.
With the Hand of the Queen gone, her reign starts to decline even further and it's only a matter of time before large scale riots in King's Landing start breaking out. To secure her position she agrees to marry Euron in a speedy ceremony and not wait for the war to end. Euron promises to utterly destroy the army of the dead and starts preparing caches of wildfire and dragonglass cannons. Melisandre appears to Euron and also tells him to travel east but he declines as well.
While on the run, Sansa still tries to turn Jon against Daenerys and convince him to seek the throne, but he's having none of it. In the end it doesn't matter though as a good portion of their forces, including some surviving Dothraki, turn against Dany and start to support Jon for the throne especially after witnessing him single-handedly fend off hordes of undead from all directions in open battle. Jon attempts to calm everyone down by publicly announcing he doesn't want the throne, but this doesn't seem to stop the unrest at all, many people have already made up their mind, Jon must be king.
As undead continue marching south he's desperately trying to come up with a solution to get the people ready for battle and united rather than infighting so he announces his formal marriage to Dany after a swift secret ceremony and that they will rule as equals as recommended by Tyrion. This boosts the morale enough to defend their position from a smaller-scale undead attack, but after that it's back to infighting and they are in a very vulnerable position with a much larger attack incoming.
Varys orchestrates an elaborate plot to put an end to the infighting once and for all by creating a red wedding type of situation that would end with Sansa and the main supporters of Jon's claim executed so the rest can fall in line. Yara Greyjoy's forces are to arrive as "mediators" but execute Sansa right at the negotiating table. Jon Snow must agree to stand aside while this happens. He appears to agree to sacrifice family for the greater good.
What really happens is that Jon Snow walks into the negotiation room unexpected and without any warning stabs Dany on the spot, saving Sansa and putting an end to the dispute. Dany looks him right in the eyes as she dies, with an incredulous look. She never expected this. He then publicly denounces Dany as a traitor and usurper despite Varys being the only one who knew and orchastrated the plot with Dany kept in the dark about it. He publicly embraces his identity as Aegon Targaryen and also assures his people they have nothing to fear even if they didn't support his claim... all except Varys who is executed.
Varys last words are a warning to Jon that he'll never win without her dragons' suppport and now they're his enemies, having murdered their mother. Jon points out he never wanted any of this but he'll embrace his destiny as king if it means stability and victory for the living. He regrets that Sansa forced his hand this way. He also reveals he had the dragons restrained previously and he'll use Bran to control them one at a time.
Sansa appears pleased with the events but Jon will no longer speak to her. She insists he'll come around once he realizes that court politics will even dirtier once he ascends to the Iron Throne.
Arya is disgusted by all that just happened and plans to leave.
Greyworm, Missandei and many others defect, but most stay with Jon, including most surviving unsullied not having much personality of their own anyway. They are killed later and raised as dead.
Their keep however is suddenly attacked much sooner than expected and in the chaos the White Walkers recover Dany's body before it is burned. She is taken up north to be resurrected, not as a wight but a unique White Walker bound to the will of the Night King and... immune to dragonglass and with the ability to control the living dragons.