With any wireless service, you have a limited amount of bandwidth. That bandwidth is shared by everybody connecting to a tower.
If you have more than 1 person trying to use as much bandwidth as they can, it will just degrade the service for everyone.
You could get another frequency to operate on, or use more directional antennas so that less people connect to each transmitter, but that will only delay the inevitable.
In these days of ever increasing bandwidth demands, there is no way that wireless can supply that demand.
With a wired connection, you can add more cables.
With a wireless connection, that is not an option.