For what I know from Google, the Intel Edison 500MHz dual core atom performs as good as quad ARM Cortex A7 RPi2, and the power dissipation is only a fraction of it.
Which means, if Intel integrates an Atom Z3770-like CPU with an Altera 150K LUT Cyclone V fabric along with Intel's 128M eDRAM, the combination can FUCK ALL SOC IN THE MARKET, while keeping the BOM below $200, which is pretty sweet for high-end users.
The combination you describe looks like a very good product, powerful, low power ,versatile, very useful in embedded , although it can be improved a bit by adding another real-time core , i.e. one core running RTOS/bare with the other running linux.
Two big problems though -
1. is BOM below $200 low enough ? it seems very expensive.
2. Do people trust intel as a supplier for long living products after having bad history ? are people willing to use a product without alternative suppliers that is very hard to port from ?