I would say that before this year it would have been investment bankers. But from now on it would police officers. Investment bankers have too much to lose.
Did you sleep through the Democratic primaries this year, or do you just want the GOP to be a party comprised solely of poor, uneducated White racists THAT badly?
Even if Trumpism gains some momentum, you are ignoring the fact that the Democrats' base - whom they are ABSOLUTELY beholden to, as well (see Hillary becoming an ardent protectionist or Bernie pandering to BLM - literally HATES investment bankers. They talk about them like they are literally evil people for doing what they do. That's not changing anytime soon.
The base is irrelevant - the Democrats are as guilty of abusing their base as the Republicans are. The Neocons in the GOP never cared that their party had isolationist anti-Semites in it, in fact, they sought their votes. The corporatist establishment in both parties are not so different.