Anyway p2sh and the multi-sig support and such is far more significant protocol level stuff than the modest proposals to better support sidechains. If all that stuff doesn't turn Bitcoin into 'Funny Money' (note the capitalization appropriate for religious-tinted dogma) then I don't know what does. That didn't kill Bitcoin. I myself was actually concerned that it would, but not for phony-baloney economic reasons.
huh? why would you think multi sig would be a threat?