Scaling down is hard. Look at OpenPower. They are feeling the heat from Xeons and know they need to scale and price down, and yet the scale-out Power9 SKU won't be out for what, another year? And how long until actual OCP gear ships, which probably will still cost like a decent Hyundai sedan?
Intel had nothing to offer to compete with ARM in mobile space. Largely ignored ARMv8 servers when they were mostly specialized or micro. Now E5-competitive chips are entering the market
from multiple competitors, and even mobile SoCs have grown up into laptop chips...