squeak, I've played the NP30. Not a big fan, but I merely brought it up as an obvious candidate for 76 PSR keyboard because it IS very light and cheap, the two criteria Yamaha seem to think appropriate for that line...

Yamaha would have to do MUCH more to the DGX line than the simple stretch to the PSR case, Ian. You and I both know how dumbed down the DGX line is compared to the PSR (or you'd have one rather than hauling an 88 around!). Gearing up to accommodate everything that a PSR OS and sounds would bring to the DGX line would push the line into altogether new and more advanced areas (not exactly up Yamaha's street, policy-wise), whereas adding the NP30 action to the PSR line wouldn't change a thing, including weight, much... Personally, I think it would fit in with Yamaha's existing product identity better than a beefed up, pretty different OS DGX...