Cat-5 will never be prevalent throughout the home... especially seeing as it is pretty much obsolete at the moment (most new installs are Cat-5E or Cat-6
) I have a Cat-6 network throughout my flat, but I will consider wireless for my next place.
There are many things against fibre in the home within the next few years:
1) Expense. Although this could reasonably be expected to decrease as demand increases, it will still be more expensive than copper
2) Need: the 10gbps ethernet over copper standard has already been approved. That's right, 10 gigabits per second. Not 1, but 10.
3) New technologies: faster and faster wireless systems are coming out all the time. My sister's new flat is receiving a 108mbps wireless network in the next couple of weeks. No hassle, no faff. If she wants to do some work in the living room on a laptop, there it is, on the network. Plus everything in Star Trek is wireless (they walk around with those palmtop things doing work) therefore wireless is cool.
4) Ease of installation: perhaps the crux. OK, so many of us have experience of plugging an SPDIF fibre from our DVD player to our home cinema system. It's easy. But how many of the sparks on this site have fibre experience? I doubt there are many. It is a fairly specialised job. Bend radii have to be adhered to strictly, otherwise the light stops reflecting inside as it should. Special tools are required. Current wired networking solutions for the home can be installed with the minimum of specialised equipment. An IDC punchdown tool and an RJ45 crimp tool... combined cost, £10-15.
By the time fibre is cheap enough to make it viable, we will all be using wireless for everything. Who wants to have to plug into the wall when you can wander around the garden with it?