I think ASUS should help people with previous platforms to use M.2 in RAID mode.
One PCI-E adapter with x4 for 2x M.2 and little heatsinks would be nice to launch. They have only for one and for 4x M.2 huge adapter for x16 slot.
I'm sure people with X79 and X99 and Processors with 40 PCI-E lanes would like something like that.
It's important because 960 EVO 512GB are affordable and in RAID 0 faster than 1TB PRO.