Rather than at the house (where I agree Comcast speeds are enough for me currently) I'd really love some kind of mobile Google Fiber network purchase. Something like $10/month for lightning speed wifi in tons of hotspots all across the city (Fast food, coffee, airports, shopping malls, etc). I typically never join public wifi spots since they are slower than the 4G network my smartphone connects to (plus I still have an unlimited data plan)
I'd take a much quicker set of public wifi hotspots over boosting further speeds at home. I already get about 5-6 MB/s most of the day/night.
I thought I heard somewhere that Starbucks was going with Google Fiber where possible