It *wont* be enough, but it's not because the technology isnt sufficient.
See the fiber to the home is sold as a panacea for problems that it wont actually address. If your uplink is throttled back to nearly nothing it doesnt matter a bit how wide your pipe is otherwise, it's still inadequate. A simple 1gb symmetrical dsl link over copper wire is something the ISPs have the ability to offer but absolutely refuse to. So what will they offer over fibre? 40mbps!!!! (But read the fine print, it's 256k up, and absolutely worthless except for 'consuming' their 'premium' offerings.)