The real impact we expect from 3D XPoint lies in Optane Memory(surprise!) and eventual Optane DIMMs. The former, needs support for multi-drive and secondary drive configurations. The technical knowledge needed for Optane Memory on a DIY computer can be, depending on your luck steep. But pre-built systems are where the volume will be.
Optane DIMMs won't make any impact on the consumer side, but it will on the server and workstation. Eventually though, that's where the dream is. With OS/BIOS/Application fully built and optimized to work with Optane DIMM, we can ditch the basic computer architecture we've been using for 50 years. The benefits brought on by that will be something everyone will see. Of course that's probably 10 years away.