I'm not really sure what they can do to incentivize
online poker, they are doing away with catering to the regular, it's not helping, online poker is getting smaller and smaller. I would obviously say promotions and rakeback, but a lot of places are slashing away at that, not to mention online poker is no joke, it isn't easy. I would also say big guarantees help as well, it's to bad Carbon once had pretty good guarantees and now their crap.
pokerstars is just turning away more and more regulars with their recent changes, and that is ultimately going to affect the poker population further.