I'm sure that, as the coming years and decades pass, internet services will get faster and faster as new technology is introduced. At what point would one say that it was not broadband anymore but has become something else?
Actually, I'm not altogether convinced that data speeds will get all that much faster. And by faster I mean by orders of magnitude. Because of the sharp rise in recent years of numbers and types of devices connected to the net and devouring bandwith in ever larger gulps, I fear the information superhighway will become akin to the real world highways that become ever more crowded (at certain times) as capacity increases.
Or to put it another way, we are faced with the red queens race, where you have to run as fast as you can just to stay on one place.
I think that 'broadband' will be supplied via satellites in the future. Fibre optics will be for high spec machinery that require high and accurate fast response in the practical world. There will be no telephone cables at all.