In my opinion, simple solution. Allow 2.6 to become, for all intents and purposes, the new demo version, but still charge for 3.0.
I mean, then they get Free Toribash, like they want, but if they wanna get 3.0, they must buy the game. Of course, they can have a demo version of that, but its gonna be like the current demo version.
Of course, I haven't thought this through that much, but I both agree that the community should grow but also that the regged members shouldn't be so casually cast aside... It'd need more then 20k toricreds to fix that.