This has been coming for years, and will continue to be the gold at the end of a rainbow.
At the end of the day, we need fibre into buildings for cheap, reliable, high speed access.
Mobile companies overcharge. they always have and always will, so mobile broadband will only become viable if the fixed lines keep putting up prices and reducing allowances.
The more people use mobile connections, the worse it gets. I remember when mobile telephones had a good call quality. These days I'm lucky to get one good call in 10.
Mobile high speed access sounds good, but in practice I neither need or want it. Fibre to the building, wifi to the device will be fine for me.