Hmmm... Well, I'd definitely like to see a long-running game; it's always an enormous amount of work to make the character feel like a living part of the setting when you start at level 17+! They just seem like they should have so much history by that point. Definitely color me interested as a player.

As an aside-- I'm running a game right now using "archetype gestalt"-- characters pick only one class, but they can gain the benefits of archetypes that trade away all of its class features (in an internally-consistent way) once without actually losing anything (and could potentially pay the actual costs for other archetypes as well). So they have a much more flexible array of class features without the raw power of actual gestalt. Is that a system that fits with your hopes? I can't tell how important the Sorcerer is to you.