My parents' will need guardianship eventually, but I can't afford it - help please.

My parents are fine now but there will come a day, maybe in the next couple years, where a guardianship may be needed due to declining mental health. The thing is...no one wants to be that person (not one of my mom's 6 living siblings), and I think it is very reckless for me to do it. I'm only 21, fresh out of college as a biologist. I refuse to give up my dream of being a biologist to move home and watch over my parents - they paid for my schooling! They have home health paid for by the state, and I control their money as best I can with my DPOA. So far it's been alright, but on occasion their choices worry me. I've heard of there being remote guardians, but is that realistic for everyone? I don't have the money to drive/fly home at the drop of a hat. I know I could get government assistance with legal fees, but that's not the problem. I don't think I'm ready for watching over my parents at the capacity of a guardian, and I know they hate the idea of it too. Like if they have to move for some reason, I'd be legally obligated to move them. They don't have the spare cash it takes to move, and I most certainly don't either. So who would pay for it? What if they need dental work that costs more than a usual visit? As a guardian, I'd need to find them help, but I also don't have the money to pay for something like that. Long story short, if I'm too young to have my own kid, then it's irresponsible that my family expect me to become guardian of TWO people because they don't want to. I'm guessing there's not a lot of help out there for this situation, but let me know what you've done. Please don't say "suck it up and do it" because I really can't.