So let me get this straight, every profession on the planet requires you to join a club frequented by management for promotion?
No it doesn't, yes there are arse lickers in all professions but the world's professions function perfectly well without seniority.
Our T&Cs will continue to be driven down as long as seniority means experience won't walk out the door when he/she has had enough.
It's simple economics, joining the bottom of a new seniority list could be more than a 50% pay cut, if they cut our pay or don't raise it say 20% due to inflation, you're still better off staying unfortunately.