Well, if congress cuts PSLF or other SL programs, they might actually manage to get the 20-30 demographic out to vote in beyond record breaking numbers. SLs are a demographic problem - they're impacting when people have children and buy houses, among other things. Realistically, they can kick the can down the road some but at some point they'll have to address it. They're too dumb to actually deal with it now before things get worse of course.
In other words, if you're eligible and would otherwise sign up, go for it.