Well Here are my two cents on rockered park skiing. And I will probably get flamed for saying it, because it is not trendy, it is not part of the cock that everyone is sucking, and it is no way innovative, just true. Rockered skis will ski slower then non rockered skis. If you ski rockered skis in the park plan on dropping in 20-30 ft higher then you normally would. If the snow is slow or you already have speed issues you might just want to forget about clearing the jump; especially since popping is not going to be as trivial. So say you do find a way to clear the jump, now you have to land. you land switch on the tip of your skis, you are probably not going to ski away. Oh and almost all of you rely on the stiffness of your tips when landing switch. If that support is not there you will wash out. The same is true for your tails when landing regular. So you pretty much will have to stomp everything perfectly if you want to land your tricks.
So I would say that you will not see everyone on rockered park skis in the next two years. Rockerd skis can be alot of fun provided you tend to keep your feet closer to the ground and don't plan on skiing that fast.
As for weather or not I think you should rocker you old skis. Go ahead, I am, If your not going to end up skiing on them otherwise you might as well, it will give you something to try out and experiment with, Do I think they will work well for jumps and pipe: probably not; can they be a lot of fun: yes