A bit premature. If you recall on instagram trying to kill tik tok, has not worked. I think your schadenfreude is potentially blurring your vision. I couldnt care less for either of these companies - but the demise of twitter is one of the most popular things to prognosticate about and i think its overhyped.
It's a 50/50 bet, if they lose no one is likely to bring it up here in future (unlike on Twitter where "receipts" are kept), if they win then they get to crow about their prescience. Pound shop Nostradamus stuff.