Hi,
For what its worth I am also a long time WMC user and hate to see it go. However, in anticipation I've set up a Plex server and have been running it in parallel with WMC the last couple of months just to see how it would work as a DVR. You had to buy a one time DVR license from Plex which I think was around $80 (it's normally more than that but they were running a special over the summer). The one time fee was another reason that I decided to try Plex versus some of the other options that had recurring fees. Anyway, I've been using Plex with my OTA antenna and an amazon firestick and it seems to be working fine without any EPG issues like the ones that always seemed to be popping up with WMC. As an added plus I can also stream from my server to my phone which comes in handy at the gym.
Regards.