Doesn't matter who the VP pick is, the big wet boi is cooked.
Trump's followers will do some terrorism like they usually do, but the majority of them will become disenfranchised and go the way of the tea party - still present, still a pain in the ass, but ineffectual. They will devote their time to Trump's new talk show and he will sell them Trump hairy balls strong man supplements and other scams.
American empire will continue to expand, nothing will fundamentally change. Blue MAGA is the new order.
I'm not so convinced. The Republicans only have a few weeks to regain the initiative in time to turn the election around and they've got nothing on Harris that they haven't already deployed.