WotC, to get me to be a supporter of 4e again, would have to change their companies stance and attitude that they have assumed since its launch.
Their communication with the player base has been poor, often one way, and very tight lipped. They could not deliver what they said they would on several occasions regarding DDI, and I just no longer have any confidence that anything I hear from an official WotC source is accurate any longer.
I'm not saying they are lying by any standard of the word, I just feel that they have the 'Sony' problem now where they may not be able to live up to their PR.
Reinstate the OGL or something equally open for 4e or 5e or whatever edition they do it in. That is a must for me to support them again, at least until I can be sure that they are going to be producing quality material. The GSL simply isn't enough.
Resume PDF Sales. This would help a long way in getting me to support them again. I am not interested at all in any DRMd solution they come up with. I no longer trust the company enough that I would feel comfortable buying a DRMd product from them, I can't be sure that they wouldn't 'turn it off' on me, no longer support it.
Support your Campaign Settings! I don't like what they did with the Realms, I admit. But what I dislike even more is that they made a huge radical change that makes most of my previous material irrelevant to the setting and then... stops developing any further product for the setting!
If they hadn't blown up the realms... this release schedule would have been fine, and I would have been satisfied just relying on older edition product and future novel lines to get my info. But since they /did/ blow up the realms... I feel that it was irresponsible to do so without continuing to develop content for it.
Put the Hairfoot halflings back in the game. Elves have pointy ears and are graceful, dwarves are stocky and have long beards, halflings are a little plump and have hairy feet. I don't understand why they want to distance themselves from the original hobbit concept of the race. Focusing on the lightfoot, fine, but completely removing the other version from even being mentioned?
I don't like change for change's sake.