I don't care if they make to tools online or not. Some people like digital tools/toys. That's fine.
But rather than (yet another) source book, I would like to see published modules. Yes, if you want to sell online PDF files, fine, but print them as well. Heck, make it a two-fer and include a digital version with the printed one (or some access to the online printed version).
The DDI subscription method left me cold and totally unimpressed.
Remember 2nd edition? With Dungeon magazine producing 4-6 adventures every month? On top of all the other published mods?
Of course, that was when an edition had more than 4 years before being shunted aside for a new one.