said by EPS :

It depends on the capacity of the networks- if offering 100Mbps speeds means the network quality will degenerate into nothing with relatively small numbers of users per tower, then I'd prefer T/VZW to offer lower speeds for a better overall experience. But if the system can provide it, and there are no technical barriers, why not offer 100Mbps speeds? Of course they won't be cheap... (Then again, cellular carriers up to this point have not really had "speed tiers", the closest thing being whether you wanted 2G or 3G data)