WotC (and others - Goodman's OAR series, for a huge example) seems to clue in that customers are more comfortable buying "what they know" (i.e., reprints/remixes of old material) rather than take a chance on the (iffy) quality of brand-new stuff, in my opinion.
The design team has attempted to put out some new stuff like Witchlight, Golden Keys and the like, but it really seems like folks like us have pushed it aside and are just looking for when they are going to reprint from old editions (like Red Hand of Doom, hint hint).
I'd really be keen to see the design staff tackle something new and unique for the game, like the brainstorming they did back in 2E that resulted in the likes of Spelljammer, Dark Sun, Birthright, etc. - and not more reprints of the overcooked Forgotten Realms.