The tweet didn't say or suggest that older editions had died. The tweet said, "keep alive," not "bring back to life."I wasn't aware older editions had died.
I'm the kind of person who pays more attention to actions, not words. When I see them start supporting older editions, then I'll believe they're serious.
Or maybe he simply means that the VTT will support all editions....
Well both OD&D and 3rd had a "rules compendium" so that should be easy enough to add to DDI. Old Dungeon and Dragon issues would help it feel like we have more stuff on DDI because you could convert the adventures yourself. Add some agnostic DMs tools and you may start getting more subscriptions. Add a place to buy POD versions of old books and I think you should be able to build the community back regardless of edition.
Do they get to work with major incompatibilities to smooth them out, or do they have to stick to edition doctrine?
I'd say they would have to stay to the beaten path concerning any older editions than 3 and 4. That is, not change a thing, maybe adding a few options, maybe.
But more or less they'd have to reissue the old stuff again, and then not touch it.
/M