I wish I could take credit for this idea, but it's come up more then once with my fellow players in our Saturday Night game sessions. Why doesn't WotC keep D&D 4e, rebrand it D&D Tactics or some such, and then put out D&D Renaissance - or whatever they want to call D&D Next when it releases.
D&D 4e is still a young game. Heck, the Essentials reboot is even more recent. While it's not the game for me, it is most certainly the game for many, and it has a very loyal following. Many of them feel they are being betrayed but WotC's decision to kill off their game so soon after it's birth. There are also enough major differences between 4e and prior editions of D&D that making one game that covers all is sure disappoint most.
Build into D&D Next a way to integrate some of it's modules into D&D Tactics, and I think you'll cover most of the bases in a way that should satisfy most of the players.
More importantly, your 4e players won't need to feel the same betrayal the 3e and prior players suffered when their rules of choice were canceled permaturely.
A Worldbuilding Aside - There's a Florida proverb that goes, "When you're up to your neck in alligators, it's hard to remember that your initial objective was to drain the swamp...
3 hours ago