"the political establishment is not keen on promoting people determined to undermine it"
That, very much. Going into politics is like entering a monastery : you're going to spend all your time with the same people. If you are completely against everything they do, you are by definition uniting them against you. And they have more experience than you. So your failure is a foregone conclusion.
The only way to change the system is create an overwhelming public movement against it that the monks can simply no longer ignore. Takes time, dedication, mountains of effort and probably not a small amount of cash. The only alternative is to wait for people to wake up, but, save for a miracle, you'll be dead before that happens.