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I guess that , seeing that everyone will be affected, there will be much debate on how to proceed and the best ways for individuals needs.
It should become clear, before the switch over happens what is on the table so to speak!
It will be all over the internet, television, it may even happen that so many people can not or don not want to switch and they will have to keep landlines if people want them.
However they will put forward unbeatable deals to woo the rest of the population just keep using their mobiles.
Mobiles aren't my favorite way of communicating and I as much as possible use my landline!
I'm guessing 2025 is when they will roll out 5G because before then there are too many spots with no coverage.
Where I live there is a decent local population but I still can't get mobile coverage in my house.