I would suggest Yamaha shoot for something better than the G4. Ski Doo makes the heaviest 2 stroke, widest most ill handling deep snow sled on the market. Start shooting for Axys handling with Yammi reliability and you have something to shoot for.
I don't know how you can say its the most Ill handling! The axys, and doo are both awesome in their own respect. After spending a good amount of time on all the the big three, I always seem to keep coming back Doo. But you are correct that they should try and make something better....competition drives innovation.