The best replacement for htpc is roku.

The best alternatives to htpc are rated as following:
★★★★★  roku
★★★★  nas
★★★★  tivo
★★  smart tv
★★  media server
★★  media player
★★  google tv
★  dvr
★  roku 3
★  blu ray player
★  pvr
★  oppo
★  dvd player
★  media streamer
★  streamer
★  boxee
★  android box
★  boxee box
★  home server
  raspberry pi
  set top box
  dreambox
  dvd recorder
  media extender
  xbmc

Your alternative for htpc is not listed? Suggest!
Speaking about htpc, one probably shouldn't forget about uverse.

Other search terms related to htpc and their ratings are:
★★★★★ uverse
You have in mind a companion for htpc and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of htpc in all years. Click on graph for more.
htpc
roku
nas