While desktops are not going away soon, their days are numbered. The amount of movies that I convert these days are few and far between, so there isn't the need as there once was for mega powerful desktop PC's.
We have a smart TV, and generally just stream movies from the likes of Netflix. If the smart TV doesn't have an app for a streaming service, then I simple stream it to an Android phone, and cast the stream to the smart TV.
Movies that I do have converted are streamed across our home network via an Intel Atom based server to the smart TV or anything else connected to the network.
If we buy a movie on BD, then I don't even bother making a backup, as not a single BD movie disk has failed.
I still need a desktop PC, and will try and get hold of an Intel Skylake CPU and build a new system around that when Skylake launches soon. Skylake is said to support hardware encoding and decoding of H265, so that will be interesting.