Basically two things here, the first is that different rules for various products and loopholes mean they could likely pretty much just... sell it until the government did something. Possibly even outright admit what it was doing and the government might have trouble stopping it in the short term.

The second is that I think there'd probably be wholesale resistance to removing humans from the decision making chain in the short/medium term. Don't get me wrong, I actually would generally favor both of these (presuming they were both mature technologies), I just don't think it's going to be technical progress that necessarily slows the AI prescription part (arguably, that might be doable now).