It's true. I wonder how many ancient Babylonians, Greeks, Chinese, Egyptians, Persians, Romans thought:

"Surely, this empire will last forever! Look upon our works, ye mighty, and despair!" (EDIT: LOL It appears we're all of one mind remembering this poem. We must be doing something right. XD)

Especially in modern times it's insanely difficult to imagine the geopolitics shifting drastically, but it's happened before, it's happening now. The difference being that the rest of the globe is now much more invested in your shenanigans with your neighbors, but it's still happening.

What does one do amidst a regime change?

I'm glad I've never had to seriously consider it until now. ...but it unnerves me that I probably need to start.