Guess R*'s mad nobody does Survivals anymore? After reading, I'm with the field on a lot of this.
On topic, I'm in favor of them modifying the Rumble, not getting rid of t completely though. While I like the mission and have no problem grinding it, nobody wanted to run missions anymore.
It was Accept invite to Rumble, Play Rumble, Get payout and go back to freemode. Rinse and repeat. It got to the point where I kill the enemies and then run around punching pedestrians while someone delivered the docs. I refuse to race so i'll find other ways to get paid, I really just want the RP though.
As far as the hosting mission thing, I agree, close your missions if you don't want anyone to join. All it takes is a few button presses to do it. Those that get mad at players who join through Quick Job are indeed lazy idiots.