No, DSI most certainly does listen to suggestions. They've proven it by adding many features to their instruments after their release. That's just a fact. I don't know if you've owned any of their keyboard synthesizers, but the differences between the first run of one model and the same model a few years later are substantial, with all sorts of user-requested features added. What DSI doesn't like are finger-in-the-chest demands, nor do any of us.
Otherwise, I agree with you. I'd love to see an Evolver II as well. There's nothing like an Evolver, which is why I would have been happy if they had simply maintained the original Evolver line.