How many people currently max out their 40Mbps connection continuously? Very, very few.
Will getting an 80Mbps connection change a users habits? Probably not, or if it does, by just a little. Films will down load faster - but no extra data ... so the big downloads for most families will just happen in 60 seconds instead of 100 seconds!
There might be a little extra congestion at some of the really peak times but in general, I feel it will not have an impact in the near future.
M H C
taurus excreta cerebrum vincit