IMHO: Polaris and Cat NEED turbos to be competitive with Yamaha. We all know that if either one made a 4-stroke Mountain sled, it would fall on it's face without one.
I suppose the option would be nice for the rest of the line-up, but why? You have a choice between 80 Hp, 120 Hp, and 150 Hp. For most people, 80 MPH (Phaser) is too fast anyway. Especially to those who are already working against the sport. The industry is working overtime just to keep the EPA happy. If we press our luck, the industry will be working overtime to keep the insurance companies happy too. Both have a tremendous impact on the success or failure of this sport. Throw a few angry land owners, and someone who loses a loved-one because the machine they were riding, or got hit by, was made insanely fast for a trail that has a posted 55 MPH limit, and then where will we be? We will be fighting liability issues just to travel 10 miles @ 25 MPH on our favorite trails.
Right now, the Phazer should draw a huge following for those who are ready, and willing to dump their old 500cc and 600cc 2-strokes for a less expensive, high performance, clean, quiet, no oil burning 4-stroke, that doesn't weigh as much as they've been told to believe.
So I'm fine with Yamaha letting those who want more power, do what they've always done: Spend more of their own time and money to get it.