I picked 50/50, but there's some explanation needed...
If I end up DM'ing 4e, almost certainly; Dungeon, Dragon, and a bunch of other online tools for $10/mo sounds like an excellent deal in that case. Really, if you're DMing 4e, have a Windows PC and a good internet connection, and aren't broke, I don't know why you wouldn't subscribe to D&DI.
If I end up playing 4e, and there's a lot of useful content for non-DMs, possibly. I can certainly afford it, and all the tools should run fine on my PC. But if I'm a player rather than a DM, and not involved in any virtual tabletop games (and short of getting the old gang from college together for a session with players in San Diego, LA, Boston, and Raleigh, I can't see it), I'm not sure I'd get all that much use out of it.
If I'm not playing or running 4e, then almost certainly not. There'd have to be a pretty significant amount of SWSE stuff, and I'd have to want to play 4e even though my group wasn't switching/hadn't switched yet.