Not willing to have an ethernet cable run the length of the house and up the stairs. Never had an issue with WiFi before though, only now with the PS4.
Needed a better router anyway - but I think you're right though, since the PS4 do not support the new AC standard, so will just use the powerline adapters when they come.
I've been using power line adaptors for years.. think they are great. For my set up I have a switch from the adaptor in my room, which then feeds pc,wdtv,sky and ps4. No issues at all.

