I'm guessing it's going to lock the non-sighted//keyboard only users out of the anonymous Internet. I'm guessing if you log in and give up your anonymity they'll consider you not a bot.
If that's true, attackers just need to run their bots under registered throwaway accounts...
The account will require a phone number and the US is trying to move away from burner phones. As long as we don't commit thought crimes and we love Big Brother all will be well.