Since this bubble is largely being driven by private investors it seems like the broader economy won't suffer but will instead benefit from investors losing their interest in stupid games.

Bet on the first. The US economy is probably getting healthier, dropping/burning the dead wood.

Now, US politics... that circus looks weird from the outside, but whatever works for them ¯\_(ツ)_/¯

The next presidential election, despite being an absolute circus, should keep things split no matter who wins. This makes political stagnation a reliable bet for the next 2.5 years, possibly even longer. Normally a good sign for markets as little new regulations/change will be occurring.

It looks weird from the inside too.