I think the whole point OP is trying to make is that at the moment bandwidth works sort of like gym memberships or even airline tickets - they count on not ever

I think the whole point OP is trying to make is that at the moment bandwidth works sort of like gym memberships or even airline tickets - they count on not everyone showing up at once. In the even everyone shows up at once, sort of like in your scenario, infrastructure will of course have to be built out, but prices will rise as a result.