We all know we'll never get any platform other than Rack Extensions in Reason, but I'm just pitching this as a way to get more people to use the RE platform, and by extension, to get more people to write REs.
So imagine some VST/AU based Rack Extension host that will allow a (limited!) Reason Rack to live inside another DAW (perhaps a single Combinator instance?). The host itself could be free, or sold at a low cost with an upgrade option to full Reason. It would work as a way to both sell more REs, to get more people developing REs, and to demonstrate the awesomeness that is the Reason Rack to people who haven't had the chance to experience it yet.
So how about it?