I hope that Media Center keeps on going in Windows 10, but I won't be surprised if it doesn't. I have a Windows 7 based Media Center server running headless (actually it's on a KVM switch with my main desktop) with 3 Xbox 360s as extenders around the house. I've got it set up with 4 OTA tuners and 4 cablecard tuners. (It was one of the 1st Ceton quad tuner cards that came out back in 2010, I think.) This setup is still pretty amazing today but at the time it was astounding. My wife likes to record a bunch of new shows at the start of a TV season to see if there are any she likes. The first time she did that after getting Media Center set up she asked me what was going to happen since she was sure she had too many things scheduled at one time. I looked at the list and there weren't any conflicts; I think maybe she had 5-6 shows recording at once and was stunned when I told her that wasn't a problem. Some of our friends have been interested, but only one them ended up using Media Center as an OTA DVR when they cut the cord. I guess that's a big part of the problem...
Sort of a side note, I did purchase a Windows 8 Pro license for the Win7 Media Center PC back when it was available for $40 with the free Media Center add-on, but I never upgraded since it seemed kind of pointless, especially since 3rd party extenders like the Ceton echo don't work with Windows 8. Not that I'd necessarily choose that over a 360, but there are a couple of places where I might want to put a TV where it'd be nice to have a quieter, lower power option. And it's just a sign to me that MS is winding the ecosystem down. A shame, really.