Well, since I'm mostly on the sideline of the XT issue (because I don't consider max block a significant enough economic factor), I'll add that the protocol literalists have spun a respectable number of fabricated crisis narratives themselves (uncontrollable spam, lack of LT mining reward, etc.). IMO, it replaces one potential pitfall (mostly technical) with another one (mostly psychological): turning the Blockchain into a pure high-stake clearing network before it had a chance to establish itself as a useful, reliable tool for smaller transactions is not without risk either.