There is absolutely zero replacement for the full functionality of WMC. I spent quite a bit of time looking, and frankly, XBMC and Kodi, etc., really aren't solutions, and for what they do replace, the functionality or quality of the offerings is distinguishably worse. Until WMC or a suitable replacement is reliably available for Windows 10, all of the HTPCs I have built and set up are unable to be upgraded, and all new boxes that may have a tuner card are not going to have Windows 10 either. I would like to add, I too would gladly pay for WMC in Windows, provided of course it hasn't been somehow stripped of functionality. What I suspect is, Microsoft had to kill off the free, pack in WMC in order to roll out a new version that they can monetize. That seems to be the case with all of their offerings going forward.
"Cablecard Bro" - Spot on with this comment. People offering XBMC or other software as solutions, don't understand the problem they are offering to solve.