While I kind of agree with the sentiment whose to say the replacement will be any better? And who even has the power to replace the system? Working from within and doing what you can to improve it sounds like the most plausible solution to me.
Sounds great, won't work. Nobody who's in the system wants it changed. The only people willing to even work in the system are corrupt or unable to cope outside of the system.
Well that's how we got into this mess in the first place. The only people who seem to work in it are incapable of doing the right thing. Doing nothing isn't going to fix it. And burning it to the ground isn't a realistic option.