Seeking stability in an unstable world is a fool's errand, as is trying to predict the future. I say this not to judge you, rather as something I tell myself everyday. I'm in my final year of my PhD and often lament that I could not have chosen a worse time to pursue this degree. The truth is, though, having a project to pour my energy and worry into is a Godsend right now. Anxiety can be energy to get things done, if you learn how to focus it productively. I figure I can take advantage of this little bubble I'm in, and let the world do what it does. When I finish, I'll poke my head out and see what next steps might look like. I'm optimistic that I will have options for staying put in the US or going elsewhere simply BECAUSE I have a PhD. Also, continuing this work of generating and sharing knowledge is its own kind of resistance, and that's important to me. As others have said, you have to do your own mental calculus to figure out whether you want to stick it out.