Let's see...airtime was a dollar a minute. Four bucks a minute if you added long distance and roaming. And there was no text or data. Then there was SMS (not quite the same as text) which was FREE to receive and a dime to send. And data, well, data just hurt. Then SMS became charged at both ends. Voice rates dropped, long distance disappeared, roaming disappeared for most of us. Unlimited data came, got throttled, went. SMS was replaced by texts, as all calls became digital so using the control channels for "one packet" no longer made sense. And texts were priced at some 5000x the price of voice calls, based on how long that one packet really took to pass through the network. Oh wait, now instead of 5000x they're free too. Hmmm...
About the only thing you can say for cellular pricing, is that everything old is new again. The cellcos have no idea what model to use for profits, so they try 'em all, and what they swear is impossible today, they swear is absolutely necessary tomorrow.
Whether 5G will need to charge for bandwidth, or whether WISPs will charge for it--like some major cable companies already do--doesn't really affect the question of whether it is a good gamble to go up against the path of an 800# gorilla.