1. Use the D&D brand. D&D computer games for Wii, DS, PS3, XBox 360, and pc. D&D board games. The Ravenloft game is a great first step. Reissue the classic Dungeon! board game with a big D&D logo on it. If I still have an association with Hasbro, D&D Monopoly, D&D Clue, and D&D Risk should be worked on.
The suggestion up-thread of D&D Legos is absurdly brilliant and must be implemented post-haste. I want to take apart my Lego Mind Flayer and Lego Beholder and put them together into a Mind Beflayer!!! I demand that product be produced right now!!!
2. I realize that I am not really in touch with the current version of D&D and the people that play it. I hire someone who is. I want that person to helm the continuing production of 4e.
3. Freeze editions. We're done doing different editions of D&D. There will never be a 5e. We may re-issue older editions of the game, but the only thing that D&D is in the future will be what D&D has been in the past. If one of my designers comes to me with a hot new design scheme, it will be a part of another game.
4. Put out non-D&D rpgs. Single box, relatively complete rpgs, not unlike the original versions of Star Frontiers, Top Secret, Gamma World, and so on. I want to sell more different games and less supplements to games.
5. Put out an "evergreen" version of "Classic" D&D. I want a boxed version of pre-3e D&D that is a relatively full and complete version of the game available in a boxed set that sits next to Clue and Scrabble at Wal Mart. The 1981 B/X version of D&D would be a decent model to go off of, with the two books smooshed together, with a few editorial scrub ups, and some snazzy new art. Add a nice B2-style adventure module, and maybe some geomorphs and other play aids. Add ad-type all over it - "The Classic version of the game!!!"
Customer confusion be damned. D&D players are smart. They can figure it out.
5. Move support for everything online. Every game we produce has support on line, scenarios, rules additions, campaign worlds, and so on. A lot of "teaser" stuff as well as fan created material will be free. Sell professional materials. Create and sell more on a demand basis.
6. Print on demand for as much out of print D&D stuff as possible. Other rpgs, too. If I've got the Avalon Hill and SPI back catalog too, I start investigating means of capitalizing on those titles... If PoD works for them, great. Otherwise, flash CPU games perhaps? Like the various multi-player versions of Scrabble and Monopoly floating around social networking sites.
7. I want my web site to be the home for all hobby gamers on the Internet. I want everyone to be welcome. I want tools applicable to all types of games available to people. When someone wants to put a remote rpg game together - any rpg game - I want my site to be the place they go. When someone wants to advertise a game or convention, I want my site to be the place they go. When someone has a rules question for any version of D&D, I want my site to be the place they go.
But I don't have to reinvent the wheel to do this. Use what's already there. Be more of a clearinghouse than a end source.