I said it yesterday in the other post and I don't wanna be repeating myself but when talking about infrastructure I see two critical points: technology and bureaucracy.
Technology can in fact hold up (with a lot of capital and work, and other exchanges popping up to cover demand).
You cannot rush bureaucracy. You have 6 months to convince banks to process 100x the amount of money they process today, all the while trying to comply with as of yet unwritten or non-existant laws and regulations. You have to go up the chain link by link, and sweet talk every player in every country. Just not possible.
Also, consider, a 100x price implies 100x more fiat processing BUT it does not imply 100x of the technological aspect. Price discovery does not equal every-day use adoption.
tl;dr: technology might be able to cope; bureaucracy can not keep up.