thats kinda true and kinda not. alot of that shit is possible and in the future alot more will be possible. though there is some stuff that just plain old cannot be done on two sticks of any kind.
skiing is kinda learning what skiers and only skiers can do. when my snowboarder friends watched idea they were saying how they wished some of the stuff they were doing was done on snowboards. and they always say how skiing has the best grabs cause so much is possible having two boards instead of one. skiing has two boards, we can use that to our advantage. that doubles our possibilities in some ways, and takes away possibilities too. so instead of crying about how we arent as good as snowboarding we need to do our own thing.
skiing cant copy snowboarding exactly, but its progressing so damn fast it could definatly get equal with it or even pass it up. with all the new technology with skis like butter zones, rocker, dual camber, etc.... all just in the last couple years, skiing still has so much more to progress. and some crazy shit is gonna be possible/is possible.
the only thing really holding us back now is our attitude, ski movies are so extremely terrible at being fun to watch, it really realy really holds us back. the give the sport a hardcore badass, feel, which is about the gayest "feel" a movie can have, thats shit is for football, not skiing.  ski movie companies are so afraid of being creative and fun, it seems all they care about is doing the most epic crazy shit they can think of. and i definatly think we have easily passed snowboarding on the "extreme" level, now why not just have fun?
so yeah snowboarding is obviously progressing, but its slowing down, skiing is progressing alot faster and its still speeding up, eventually, hopefully soon, we will catch snowboarding, mabye even pass it!