I think if you had automatic interpretation, removing much of the financial incentive to learn it, and even likely a large portion of the social incentive, far fewer people would learn it.
I learned ASL, as a hearing person, to be able to communicate with deaf friends anywhere and with my (hearing) spouse and other friends in noisy or large places. It's also a hedge against my future potential hearing loss from tinnitus.
Automatic interpreting wouldn't solve any of those and neither it nor automated captions take the place of human-understood interpreting. I think putting ASL in something like VR where it is more visible to the hearing world might broaden its reach?