When I was young I tried to future proof. I installed 8 core cable to telephone points and had twin sockets at each point, one was direct the other internal and the fax machine would link the two and the telephone had two ringing tones one auto started fax the other just rang so two numbers and one phone line. The whole lot is now redundant, no longer use fax and phones all cord less.
Point is don't bother trying to future proof just fit what you need now, as likely everything will change.
I think there are about 4 programs you can get with freeview and not with freesat so is it really worth having freeview?
Sky are using fibre optic broad band and you can watch TV on the PC. Not sure if dishes and LNB's will be used in the future? Not sure what this new sky box does, for me really no point I am still in the land time forgot and use SCART plugs, and RF links to rooms. Even my TV's are old analogue types.
But I would say size matters, watch TV on 14 inch screen in bed room and even a poor signal looks OK. But on a over head projector you really need the HD and I can't send HD through my coax.
Using free to air or freesat receivers has some advantages. The programs recorded are not encoded so can be transferred device to device quickly i.e. not real time.
My advice is look at what you want now, and design for that only, designing for future does not work. Don't make same mistake as my son and I. He also tried to future proof, at every radiator he put a LAN connection to work the electronic thermostatic radiator valve. But you can't buy hard wired valves they are all wire less.
He does use PC's to watch TV with and yes that works well. All programs can be transferred with LAN, only one PC with a DVB-S card the rest link to that PC.
Plan 10 times, do the job once.