It’s doubtful that they would drop all their aces in response to Zen.
What you and the ggp are basically saying is that Intel slowed down the improvement in their processors on purpose over the last several years. Why on earth would they do that?
Besides, all the evidence points to the contrary, what with them being unable to compete in the mobile space.
I'm not a big hardware person, but from what I've heard the speed they released 6 core processors after Ryzen makes it likely they were capable of producing 6 core (consumer) designs earlier.
Maybe quantum computing, neuromorphic chips, GPGPU and 3D NAND are where it's at for them in the future, and traditional CPUs will be more or less commoditized.