Are you A PROFESSIONAL GAME DEVELOPER who makes SIX FIGURES A YEAR? Because if not your opinion is irrelevant!
Wait, game designers make six figures? Hard to believe that, at least in the RPG world. Maybe some of the higher-ups at Paizo and WotC, but I'm guessing that your average full-time game designer makes less. Who knows. But I hear your humor.
Just out of curiosity, what sort of features would be in such a program? Off the top of my head I'm guessing
- Monsters
- Map-making
- NPCs
- Encounter Builder
I've kind of littered my ideas throughout this thread, but I see it as having an "X-axis" and "Y-axis." The X-axis would be "from monster/NPC to campaign," with all of the steps in-between: encounters, short scenarios, modules, adventure paths, mega-campaigs. The Y-axis would be "from general guidelines to we'll generate it for you."
So the point being, you can make both any scale of DM creation, from building NPCs and customizing monsters to entire campaigns and settings, and also do it with as much or as little guidance from the program - from a place to organize your notes, like MasterPlan, to them generating it for you, with some input of course.
But, even there, I suspect they'd do better to offer a single all-inclusive subscription. The hope is that WotC recognise that DMs are disproportionately good for the game, so it is right to support them with tools even if they're a less immediately lucrative source of revenue. Which, based on recent moves by WotC, is no longer something I despair about entirely.
I think you're right and that four or five tiers is too many, but I could still see two or three tiers working fine. One, a Player's Option, two a DM's expanded suite (players shouldn't be asked to purchase Adventure Design Tools and Monster Builder), and three some kind of special tier that offers exclusive content and a lmiited edition item of some kind - a mini or hardcopy annual, or a choice. Hey, maybe they can call them Heroic, Paragon, and Epic, and cost something like $10, $25, and $40 a month.