I'm not sure what the worry is here.if WotC went belly up and the OGL 1.1, as described, doesn’t seem to allow for anyone else to publish it, granted someone could do it for gifted, I suppose.
If the SRD were to be literally unowned, then no one would be violating anyone else's rights in publishing work derived from it.
If the SRD became owned by someone else, I don't know whether or not that would extinguish the licences that WotC had granted, as I don't know how US contract law works in that respect. If it did, then that would happen whatever the particular terms of the OGL. If it didn't, then people publishing under the OGL 1.1 would owe their royalties to the new owner of the SRD. (At least in the simple sort of scenario I've painted.)