I think the patched also fixed this. I just finished playing 7 games and in all 7 games, the same guy was host, and everyone had green bars. It's either:

1) Once someone is host, the game no longer switches

or

2) If the game finds a suitable host, it doesn't switches.

What do you guys think?

I've found close to the opposite actually. Now when I get the migrating session screen, instead of just getting migrated into a game by myself as host, I migrate with a couple of people from the previous game. At the end of that game, if everyone sticks it out through my horrible hosting, someone else is randomed as host next game, and I get migrated out once again.

I've had 2 full games since the patch came without migrating, which is about the same amount I had before the patch.

Yeah Almost always the Host Migration Fails and boots me to the menu screen.

I'm almost praying that I get lucky everytime it migrates.