wouldn't you expect though; if the experience got so bad, that you'd have a sort of 'hard-fork' like we see happening all the time in the crypto space; with devs moving to whatever platform is best? That would have just been nigh impossible with close sourced software; at least there's a potential path should we ever have to confront that situation with chromium.
Practically, I wouldn't guess that we'd see that, since chromium ends up being the closest implementation to true web standards; well, since they define the standards practically, anyways.
"Hard fork" à la blockchains is a very good analogy. It's also a chilling one, considering that no hard fork of Bitcoin has ever seriously challenged it for dominance of the cryptocurrency space, and that the web has orders of magnitude more inertia than the Bitcoin blockchain.
Practically, I wouldn't guess that we'd see that, since chromium ends up being the closest implementation to true web standards; well, since they define the standards practically, anyways.