It's too little too late. Coulda, woulda shoodah. Freestyle, as a sub genre of any sport, means pushing the limits of what it is. That doesn't mean change the thing to the point that's the only thing it's good for. And that's where jetski stand up went wrong.
Hop on a pro's skateboard or bmx bike. You can ride them to point A to B. Same thing with power sports like dirt bikes or sleds.
Now hop on a freestyle jetski. You can't ride it normally, it's a device designed to loop itself out and go upside down. The entire point is lost on itself. It becomes a single purpose device and the lure of "look what you can do on one of these with enough practice" becomes a bug zapper where the owner just wants more zap.
30+k to pull a finger and go upside down. That's what it's become, and most people with 30k to blow plus the freetime needed want more for there money than a drum of race gas, a backflip, and a half assed "good job" from their spouse.