They say we'll have "unlimited" energy but it's really not unlimited, it can be petawatts but it's still finite, and people will invent new devices that will drain all of the fusion fuel as well instead of powering our current lifestyle.
People won't own cars, they'll fly themselves everywhere because it's "okay" to consume megawatts per person, and we'll end up draining all the oceans of their deuterium.
It's exactly what happened when oil was discovered, it was thought of as an "unlimited" energy source in the days of horses.
On the plus side fusion energy is carbon-clean, but its fuel is most certainly finite.
I have no idea what the future hold but a typical VR movie is ~20gig
I'm not saying VR is going to take off but maybe streamed AR virtual presence might and it will require more bandwidth than today's video.
https://www.youtube.com/watch?v=r7raHNfPc6A
And even if that doesn't, something always comes up that needs more bandwidth.