You want to stay in people's mind and in the conversation. Having four months without releasing a product won't help. Right now the conversation is about the lack of product being released, not a product that needs to be bought. Sure, we're talking about you, but not necessarely in a positive fashion. Heck, some people are worried about their beloved brand. In four months what new shinny thing will have gotten people's attention... and money?
The problem I see is that some people at WotC/Hasbro still think they are the lead RPG producers they use to be. They still think they can produce hardcover books with 200+ pages without an hitch and that people will shell out the 50$ for them.
They need to learn that they can't produce that sort of books anymore because they lack the resources and because the market has changed. Paizo* saw to that with a different business model. They need to fracture their books. Why does PotA need to be released in one hardcover? Why not three releases that cover level 1-5, 6-10 and 11-15 over three or six months? A longer release schedule might be easier to produce for designers and easier for costumers to buy. Fracturing also means you have more content over time, so you're part the conversation all of that time. Cause they can't even create hype with up coming products cause they are top secret.
Why did the splatbook need to be so big and expensive anyway if bloat is so bad? Why not just a small 60 page book that cost 15$ instead of 40$ twice or thrice a year? People still get some splat, cause we do want it, and you still manage to slowdown the bloat.
Also, people do not want huge books anymore or exclusively huge books. They also want e-books/PDFs. Right now that market share is totally abandonned by WotC. It was a bad business move in 2008, what is it now in 2015? They might have great designers at WotC, but a designer doesn't necessarely make a good business person. That being said, I'm pretty sure Mearls and co. know that they need e-books. So who is responsable for that? Hasbro? This leads to another question: why no OGL? The lack of 3PP content also doesn't help 5e stay in the conversation.
*Yup, talking about them. Let us face it, they are the industry leader and so far their business model has worked so well they moved to the top, among other reasons we do not need to discust. I understand that WotC doesn't want to copy them, but paradigms have changed (like people have these things called tablets now) and the improvisation we are seeing doesn't bode well for the brand.