Can we say that it was John that went to check on Sam that night, not Mary? Can we say that when she went to go check on Sammy, what she came into was her husband pinned to the ceiling, bursting into flames as soon as she looks up?

Can we say that she snatched Sam, woke up Dean and was halfway down the stairs when the flames started to lick their way down after her?

Can we say that as soon as it was considered proper to do so, she took off like a bat outta hell from Kanas.

She said once that the worst thing she could think of is her children as hunters.

Let's say that she moved to South Dakota, into Sioux Falls. Let's say she meets a bitter and broken Bobby Singer.

Let's say that she raises her children as best as she can until a hunt comes knocking on her door.

She'll dither, but she'll go.

I think that Dean and Sam were always meant to hunt, and John and Mary were never meant to raise their children alone.

I think that Mary will break her own private promise to herself, and I think that she'll always regret it.