Once bots get smart enough there will be no captchas that can stop them. The only way will be to ban the IP where the bot is coming from, assuming you know which IP belongs to which bots. They could easily disguise themselves by using proxies.
I guess my point is that if we get to the point were a bot can do generic requests without the aid of a human a captchas will probably not be able to stop it.
You're assuming Google would do that and/or that it will be allowed to do that once sites find out. They are a lot of businesses who have zero incentive to give their data to Google.
This "AI" is just scrapping and replacing wikipedia while serving ads.
I guess my point is that if we get to the point were a bot can do generic requests without the aid of a human a captchas will probably not be able to stop it.