Lightweight is not necessarily the way to go. Sure it MIGHT give a good wake, but it would be harder to drive. Take it to the extreme - would you want to ski behind a jet ski? It's light weight, has no wake and doesn't use much fuel.
Another example are two current production boats. Both have similar wakes. One is light and one is not. Guess which one is easier to drive? Don't know about ya'll, but I'll pay a little extra in fuel to have a smaller wake and be easier to drive.
FYI, the 200 is a game changer. That's why all the other manufacturers are playing catch up. Is it perfect? No, but it is a gigantic leap forward. All you have to do is watch someone at longer line and/or slower speed to see that. It's probably why the new Malibu exists. Also part of the reason there are so many complaints about the MC wake. I love the barge comments about the 200 - 4" wider, 6' longer and 200# heavier turns it into a barge. It still will out accelerate all the others. It also doesn't launch the longer line skiers....
I agree with you though, the next game changer will have to ski AND drive like a 200, but at a lower price. Not sure it can be done, but they will sell a lot if they do.