oh yes indeed, the CME xkey is getting close toward infinite pivot length. The second closest will be synth keyboards - aka 'semi-weighted' (spring) keyboard.
There's still always going to be the ones that will reckon CME xkey will still have some push-back (regardless of how much it is). And they can't handle the push-back. It's just too much.
Casio - time to roll out the top secret - power pianos ultra-light glove project, with sensors fitted in the ultra-light breathable gloves themselves. And a 'foot glove' (for the pedals). So we just need a bench-top and a seat only. Hardware pedal is an option too though for those that don't want to put on a foot glove.
And for the V2.0 project, we can dispense with the gloves, and just go for full light beam sensing - no gloves needed.