Accepting that you are right on all 3 points, the supercharged push of AI is destroying the country (and the world) by itself. Prices are sky high, AI is being prioritized with regards to water rather than actual humans, and the results are plateauing relative to the resources expended. We won't get an obvious negative outcome, it's more insidious and systemic which is just as dangerous as Skynet if left unaddressed. So AI is probably not going to kill us in the Terminator Skynet sense, it WILL kill us through economic and water related means.

Having said that, I think Bernie is doing the superintelligence argument (even though it's probably not the immediate threat) because the people are retarded. The thing that can bring us together are pieces of art like Terminator and so using that as a reference makes it relatable to all the retards rather than giving them a nuanced explanation.