I recently started a program in ecology and the worry I've heard from scientists is that going forward funding is going to be very politically uncertain. It's hard to run a lab when you might just have grants get cancelled capriciously and have funding dry up for years at a time. I know I'm going to be looking outside the US for PhD programs once I finish my master's.

Four years of this is a huge blow to the field, eight would mean a wipeout of a generation of talent.