There is one thing WGT can do, lock out the "end round and continue" button. This will force the player to finish the round, irregardless. Once the player commits to an MP round, their forced to finish, even if a player loses connection. Every time the player logs back in, the game will take them right back where they left off, like a saved game. Now that's what you call an end game.
Unfortunately, this idea, or anything like it isn't good for business. WGT will never act on this. Players quiting can be frustrating, but it's something we all have to deal with.
Snaike, you said it best, everyone is beating a dead horse on this topic.