We will definitely see people complaining about indoor coverage for some time unless there's a huge mast deployment because the frequencies are not good for building penetration, (I predict external aerials to sprout from buildings in their hundreds of thousands).
And more people doing as I do and replacing their fixed line with mobile only, (as endorphin said).
And, I think it's going to the death of MNVO providers too, (except perhaps those propped up by their big brother/owners the MNO providers), because as fixed line replacement becomes more commonplace, people are gonna need and want cheap bandwidth and not a single MNVO is gonna be able to compete.
I'm rocking 80GB for a fiver a month right now on 4G and that's what's the best you can get for a fiver via an MNVO? 1GB? 2GB?
If 5G really is the promised land in terms of capacity then when the migration happens people are gonna be looking for at least 200GB per £10 spent, especially considering my deal and the fact that Three are dishing out 1000GB for £20. MNO can do that, probably without breaking sweat, but MNVO? Not likely.