Sinking doesn't imply fully sunk. Yes, bitcoin is still semi-useable but it's becoming less and less so. Meanwhile businesses are chomping at the bit to bring it fully under their control so they can profit more from it. There are much better alternatives.
Coinbase has an interest to increase the block size so that the protocol can be further centralized, making people more reliant on their centralized bitcoin as a service business.
Honestly, the whole bitcoin ecosystem is a sinking ship at this point. The protocol is broken and there are too many vested interests to properly fix it. It's time to move over to Ethereum.
It seems pretty generous to say she "discovered a new theorem."