That is very wrong. There is for instance a lot you can do with 4G that was not possible with 3G. With 3G the more devices the worst the throughput for all. LTE time slices and runs qos for all devices so it does not degrade with increasing device count. However there is a general linit in the the cell which is hard to raise making it uninteresting as a replacement for fiber. Future standards want to remedy this.