Your best bet is going to be using HDMI extenders based on HDBaseT and installing extra Category 6 cable for the future. The price shouldn't be an issue if you are considering fibre. They are capable of handling the full HDMI bandwidth (10.2 Gbps) at distances up to 100m. That is good enough for 1080p24 3D from a BD player, or even 1080p60 3D from a computer as long as you don't turn on DeepColor. It is also good enough for 4Kp24. Anything beyond that will have to wait for the next version of HDMI, which was supposed to be announced a year ago. No telling when or what it will be. As far as obsolesence goes, the best thing you can do is install empty conduit with a pull string while the walls are open.