I think it might actually succeed to replace TCP. There are a bunch of benefits. There is a great video here about it that you should also watch before passing summary judgement: https://www.youtube.com/watch?v=idViw4anA6E
On the flip side there are no multi path implementation for QUIC while Multi Path TCP is being merged since Linux 5.6[1], just for this I think it's won't be simple as your comment may lead to think.
[1]: https://www.phoronix.com/scan.php?page=news_item&px=Linux-5....