I very much agree with this, although my perspective is slightly different.
I think that the sport needs to go in all directions. There always needs to be people doing different stuff. Like, its really good that we have both the nimbus crew and the people doing triples. They complement each other. Its awesome to see the sport expand and diversify, and I think that people will always be pushing it in tons of different directions. Thats one thing I've been really stoked on in skiing over the past few years. Its getting so diverse, with so many people just doing their own thing.
I agree that I think there are other areas that people could be pushing, but think about it: how are you supposed to make your hardest tricks look easy? By making them easy. By doing tricks that are harder than them. The reason doubles are really looking super good now is because people are getting used to them and doing them every day. When triples come along and start happening I think we'll see all areas of jumping improve, whether its just simple 180s, or cork 9s, or doubles.