The Democrats won't change, because they don't have an urgency to change. Their opposition to the free market will mean that they will continue to oppose free trade, and Republicans will simply make an alliance with them. It really fits well with being protectionist on immigration as well, but Democrats won't change.
But Wall Street lobbyists aren't going anywhere so if they don't find Republicans very friendly to there agenda anymore they'd probably just increase there grip on the Democrats.
So Trump is inching Republicans the tiniest bit left on fiscal issues; so what? The Democrats have been sprinting there. Wall Street will obviously try to influence both parties and will pick the lesser of two evils in such a scenario, and I guarantee you that will continue to be the GOP.
