I have a recollection from when Crawley were on the verge, that a re-formed club can join the pyramid a minimum of 2 levels below where the original one had been, so BSP is a definite possibility if the unthinkable happens.
I'm sure it'll rumble on beyond tomorrow and they will start the season, though.
The conference did offer to save them a place in the BS South at one point. [To do with Team Bath giving up their spot, I think].
They be playing in L1 anyway. they've a shit season in store, and will then start pressing on. Its no big deal.