Fibers inside a home

This would be non-practical to say the least. If anything goes wrong with your single fiber optic (or any media except wireless for that matter) cable, you loose all your services at the same time. This would be a disaster. In any case, the applications you are talking about have very different transmission media requirements and, although there are converters out there between fiber and their 'native' media, using the 'native' media is always less expensive and less complex, which is important in residential environment. Additionally, your phones usually need to be powered and dielectric fiber isn't going to work for power.

As all the applications you've mentioned are converging into Everything-over-IP these days, all the disparate media may eventually come down to the one that's supporting Ethernet (either fiber or copper). However in this case you still need to pull individual cables to your devices because this is what conventional Ethernet topology requires anyways.

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Yes, but at prices that would make a millionaire think twice. At least if he wanted to keep a big chunk of his money. :)