But why would an owner of a 2k want to upgrade to a 2100? The sonic incentives are not there. I don't buy new keyboards every year, so I like to do my research and check for the best price for me. The 2100 is a definite improvement over the 2000, don't get me wrong, but as an owner of the 2k, the 2100 doesn't represent a good reason to switch boards.
Yamaha would have and would, in the future, be better off if it kept a board on the market for a longer period and offered software and minor hardware upgrades. I might buy a HD or similar memory upgrade. I certainly would have considered the sounds upgrade too. But I wouldn't go through the hassle of selling a good 2k just to purchase a 2100.