I hear you Diki. The big three are milking 128 for all it's worth and if they see no pressing need to bump it up they most likely won't. I beg to differ though regarding note drop off. You may not be able to distinguish when note(s) drop off in many instances but when it does occur it can diminish a performance. For instance, Jordan Rudess was playing a Kronos a while back and he pushed the polyphony envelope to just below 256 notes. I reckon there must be a polyphony counter on the Kronos. Anyway, I read the article with my own two eyes so I'm assuming it was correct information. If a workstation can push the polyphony envelope that far, just imagine an arranger with all its complex accompaniment functionality and other polyphony consuming features, such as Multipads, voice layerings, and of course the potentially ominous sustain pedal, etc.
Having said all that I just heard a bunch of Korg PA-600 demos and noticed it has 128 polyphony as opposed to Korg's normal 120 spec on most of their other arrangers. The PA-600 sounds amazing and the price is roughly $800 less than Yamaha's PSR-S950. It may be too good to pass up even though it only has 61 keys. If worse comes to worse I can run it through my Fantom G7 or an 88 key controller for piano parts. Hopefully the keybed on the PA-600 will have better action than the Yamaha PSR-S950 has. After playing a few years on a decent action keyboard I don't want to settle for "cheesy" if I can help it. It's like after getting a taste of high-speed internet. You don't want to ever go back to dial-up.

PS: Good to see Diki is behaving himself Nigel. Knock on wood.

Just kidding. lol