The only reason they make more money on them is because their selling more of them. You cant honestly tell me is cheaper to manufacture a hi-po 4 stroke than it is to build a 2-stroke ...
And 2-Strokes dont need reengineered to make more power, they need to smooth out the powerband, thats all. You run a 250 2-Stroke, with mild porting, and an efficient power valve design, and it will still run circles around the hottest 250 4-Strokes. And have 1/4 as many moving parts inside it, be lighter, less prone to running hot, etc.
Everyone is about smooth usable power nowadays rather than the hardest hitting powerbands like in the past. You want to see a revival of the 2-Strokes, I think they would hit home with a 350-500ish CC 2-Stroke, with a very mild port job and slick powervalve set up like the electronic hondas. Something that makes around the same peak power as the hottest 250's do now, but it would do it smoother and be easier to ride, and it would have torque as a function of displacement ... That would give the big 4-strokes a run for their money on the market. And once someone starts modding, it would lay the smack down on the track too lol.