It won't work.
If XT is adopted, XT wins, there's no other chain, or at least there's no other chain with value.
You may find someone that lived in a cave for the past year and scam them using the abandoned chain, but that's not something you'll want to brag about, I think...
we are not going to abandon the main chain! you might, i for one will NOT. If im the last god damn node running core, then be it! I would rather go to LTC, Etherer... shit even dollars before i run XT.