I'm kind of liking being the black sheep edition of the family. The writing has been on the wall since the first edition neutral publication reared its head that WotC would not be supporting 4e in any appreciable capacity. Turning over support entirely on the anemic digital offerings is really one foot in the grave. Quality over quantity, sure, but it was always an implied 1) content would never trickle down to 3-5 articles a 'publication' and 2) quantity could return, alongside quality. That never happened.
Also, despite very early optimism at his lead, I don't think Mike Mearls really likes the edition, and he's steered the ship toward new waters. Essentials was a retrograde, albeit a tolerable one had it been one explored avenue (akin to a Gamma World like stint), but we now know it really was the first flag that things were rolling back. And so they have.
I could be totally off base, but I read from this Ro3 that 4e content has been planned until December, then it's up for grabs where they want to take things. Sadly, there's no mention of the tools, because I don't think they know what's happening with them. Undercutting 4e undercuts a need for DDI as it exists now. With no direct edition support, it's hard to see where things go from here, edition neutrals and reprints until 5e I guess.
I imagine DDI will be supported until mid-next year, then turned off under the "There wasn't a large enough demand for it", despite being the very ones who smothered it. You know, like Epic tier.