You are a victim of the same opinion expressed in your rant. Instead of USAF leadership accepting the fact that they have to send pilots to the GH, Pred, or Reaper and ensuring that they do it right and equitably (and ensuring that those who get sent get back to cockpits in a timely manner just like those going to white jets), they sacrifice bodies to the machine and send them to the UAV to never return to the cockpit.
There is nothing guaranteeing that you stay a C-5 pilot, as you said, you were C-21 and would probably accept that the USAF would need you in a T-6 or T-1 or even in a command post. You are a rated aviator and you are liable to get any assignment where a rated aviator is required (and, yes, flying an asset that is bigger and heavier than your previous C-21 through controlled airspace still requires a rated aviator). The unfortunate thing is that any of the above options would eventually lead you back to a cockpit.
There is no major uprising because everyone is content to sit quietly in the corner and watch the USAF throw flying experience away and ruin careers as long as it isn't their career that is being sacrificed.