One good thing that is already occurring due to the fear of a second Trump term. Countries such as Germany are beginning to take seriously their obligation to defend themselves and Europe.
It's about bloody time. They've been freeloading on the US forever.
Even the UK, which at least joins the US in doing important things like keeping the Red Sea open, is not spending enough in the face of the current Russian threat. In particular, we have to maintain a reasonably strong navy and air force. Army is less of an issue for us as an island than it is for France and Germany.