I believe that if you know how to build and tune coils... there is no reason for rotary. FK irons makes light weight coils... so the wrist pain issue is a non issue.
I have really tried to buy into the "rotary is better thing.. but honestly.. coils are a full give technology that puts is ink very well.
That being said, would be nice to see a true give style technology that emulates a coils machine that is plug and play.

So far the next gen centri might be closest thing. Seems like everyone wants to emulate a coil stroke and hit style, but wants a light weight plug and play with the volt range of a rotary.