I agree with Fred, one of the good HD modulators available will make this pretty simple. (Zeevee or VeCOAX) and then control through URC or RTI remotes.

I have recently upgraded a clients system this way, 4 sources (House and guest Cable, Sat and Apple TV) distributed to 15 TV's throughout a 15K sqft house that was built 20+ years ago.
Used RTI remotes and a couple of their RM433 antennas connected to an XP series controller.
Because they only had 2 brands of TV's I was able to program only 6 remotes. A couple were to stay in a room (such as M Bedroom) and the rest were floaters that would be "shared" as needed in rooms when used. If a guest was staying they would get a remote and control the TV they were using.
Even if the wiring was in place, trying to do this with a Matrix would have been very costly and would have required a lot more programming and remotes.