I doubt it. There were quite a few subscribers that complained back when they made all the galleries except PHB, DMG and MM DDI sub-only, and nothing has ever changed about that even though they actually acknowledged at one point that it was poorly received.
One can *hope*, but... Yeah.
Really? "Quite a few" subscribers complained, huh? You got some numbers to back up that assumption?
Fact: WotC claims they moved to the shorter article format based on customer feedback. There is no evidence to the contrary and no reason to doubt the claim.
Fact: "Some" people didn't like the fact most art galleries are behind the subscriber wall. "Some" of those people complained through proper channels (email to WotC, posts on WotC's boards). We have no idea how many folks were actually upset, and how many of those took constructive action and complained where WotC would hear. Your claim that "quite a few" has no basis.
Reality: WotC is a company that responds to customer feedback. Just because they don't make changes to please *you* and some other squeaky wheels on ENWorld doesn't change this. Also keep in mind that WotC has to balance business needs with customer desire. I'd be comfortable in saying a lot of DDI customers want the virtual gametable sooner rather than later, but that hasn't happened yet not because WotC is unresponsive to customers, but because it is beyond their means right now.
If you are a subscriber to DDI and don't like an aspect of the service, email WotC customer service. If you are not a subscriber, but might be if they made some changes, email WotC customer service. If enough people feel the same way you do, changes will be made. If you are in a minority, or even a silent majority, then changes won't happen . . . and this does not make WotC unresponsive to customer desires.
Putting the art galleries behind the subscriber wall *IS* a net negative move, what was formerly available to all free of charge is now only available to those who pay for subscriptions. I'm sure no one was "pleased" with this change, and some were displeased, but I'd gather most don't care. But I don't know any more than you do, and WotC is trying to build value in a DDI sub.
If enough folks say, "Hey! Let's bring back at least *some* longer format articles!" Then it will happen.