Copyright was always supposed to be a bargain with authors for the ultimate benefit of the public domain. If AI proves to be more beneficial to the public interest than copyright, then copyright will have to go.
You can argue for compromise -- for peaceful, legal coexistence between Big Copyright and Big AI -- but that will just result in a few privileged corporations paywalling all of the purloined training data for their own benefit. Instead of arguing on behalf of legacy copyright interests, consider fighting for open models instead.
In a larger historical context, nothing all that special is happening either way. We pulled copyright law out of our asses a couple hundred years ago; it can just as easily go back where it came from.