I see more than 20 networks in the building I'm in, so that is already happening. Most people I know don't have cables going to different rooms, there's a rout

I see more than 20 networks in the building I'm in, so that is already happening. Most people I know don't have cables going to different rooms, there's a router where the signal comes in and wifi from there. Often there's not even the choice which room or part of the room that is. Unless your building is relatively new and someone thought about setting up the cables, it can be very expensive to do so later.