Problem with fiber is that it's not that widespread and as it costs a lot to deploy, you have to be in areas with lots of people to have the luck of finding a fibered place.

In Paris I can have access to 100mb/50mb fiber for 38€/month. For the same price I get 100mb/10mb cable speeds in Versailles since the city has no fiber access yet.
My real speed in Versailles is around 65mb down, and goes down to 40-45mb which is not bad considering that ADSL for the same prices is 5Mb on my phone line...

I might go fiber in Paris, will be more practical to access my NAS there and redirect some tv channels I do not have access to in Versailles thanks to the nice upload speeds.

And here we face a great threat to high speed internet: video streams that will probably become the norm. Be it a HD camera feed,TV channel redirection etc... creating large amounts of bandwidth to tranfer from many points to many other ones.

We're not there yet, but I'm sure it will be very quick to happen.