This may have been suggested before.

I was with a group of 5, we were down to the keeper. one lvl 42 player died and although given rez, stayed ten for 10 minutes while we chopped away at the keeper. this player was needed. however, there was no longer a game host.

My suggestion is that if the game host leaves, then the server gives host rights to the next player who had been on that game the longest. This way someone gets the power to boot.