I've done that twice as my home network grew over time. When I added cable internet (I had FIOS already), I was able to cleanly terminate COAX from the demarc in my network cabinet to hook up my cable ...
Our new home seems to include a pre-wired panel within our master room closet. - Opening up the pre-wired panel shows 3 ethernet cables and 3 coaxial cables. - Living room has a wall plate for 1 coax ...