If I were in charge of WotC (Do I have to be owned by Hasbro as well?) I'd...
1) 2-3 Campaign Settings per year with a very high level of production quality. Similar to the producton quality that White-Wolf has been putting into thier new Storytelling System releases. Each campaign setting would contain multiple short stories (very short ones) & very nice full-color imagery that conveyed the feel & theme of the setting.
I would avoid massive rules changes except where warranted by the setting itself (i.e., no Gnomes in Dark Sun). Conversely, I'd make liberal use of substitution levels & new classes based on the CS. 3-6 PrC's for the CS; balanced within the CS but not necessarily with the rest of d20. Include a list and suggestions for integration of the DMG PrCs and PrCs/Monsters from other sources. Multiple full-color maps would also be included.
To go with the release of the campaign setting, I'd follow up the ECS with:
A free 10-issue webcomic featuring good art and a decent story arc.
Races of/Power of/Player's Guide to (CS)
Monsters of (CS) - a general monster/template guide to the CS with power groups and perhaps different takes on the setting.
A Fiction Dualogy featuring the ECS
A short story anthology featuring the ECS
3-5 Adventures (published for free, if possible)
Pre-painted plastic miniatures.
2) 2-3 Largish general d20 adventures per year. A major NPC or two from this adventure would also be released for the miniatures game. Each adventure would contain a handful of unique magic items, a PrC or new take on an old class, a couple NEW monsters or races.
3) 4-6 books per year exploring various unexplored aspects of d20 with the intention on expanding horizons and risky ideas.
4) 2-4 books per year expanding upon previously popular campaign settings.
* A further 2-3 adventures (not free this time; but still cheap) in the campaign setting.
* Another trilogy of novels set in the campaign setting
* As always, there would be a miniature tie-in
5) 1-2 DM and/or Player advice books (ie, step-by-step class creation or monster creation), maybe some anthologies of feats/PrCs/equipment/spells that got released a couple years ago along with some new material as well).
6) 1 Monster book (general) per year and 1-2 smaller but more specialized monster books (like the Illithiad, Sea Devils, or Draconomicon).
* As always, there would be a miniature tie-in
7) 2+ "Complete" books but based around certain themes rather than classes. Combat focuses on combat options, new rules, streamlining rules, experemental rules, feats, PrCs, some new equipment, some new spells, and tip/tactics for existing classes (like, how to make the armored mage concept work).
* As always, there would be a miniature tie-in
Well, that's my take. Its a lot of adventures, but settings need adventures (even if those adventures don't make any money).
The DVD idea above is excellent. You could give those away with miniatures game starter packs as well. 2-3 page expose's can be purchased in 'mainstream' gaming mags that also contain this DVD.
I might also try to develop a PDF publishing arm for the company that would release free/cheap adventures and or/campaign add-ons. If real releases were put into PDF, I'd make them simultaneously available and the PDF would have to be as cheap as a physical book purchased on Amazon.com. It'd be nice to find a way to get people who purchased both the PDF and the physical book a rebate of some kind.
I would also encourage the fans out on the 'net to come up with adventures or d20 concept expansion books of thier own; Publishing the cream of that crop, with royalties to the author, using my PDF arm of WotC.
