Of course everything depends on takeup and access to a shared resource, although if they use L2 or L3 rate-limiting or allocate a fixed number of time-slots in the wireless lower layers then that changes the story.
But it might be that if you have no neighbours or there has been poor takeup in your cell, then you are very happy, for the moment. When everyone finds out about the service then the honeymoon is over with hundreds of users and the nightmare case would be dialup speeds.
Virgin cable has always sounded scary to me because of shared access. There is a local wireless system in the village which sounds scary to me for the same reason.
Still, this is very interesting indeed, as 3Gbps or even 1Gbps could go a long way in some circumstances. The mobile operators might be incredibly greedy though, yet again. Mobile networking charges have always been ridiculously high in the past and there is no reason for that to change, unless they wake up and realise that they have been strangling a potential market, preventing it from ever getting going, for years and years. The companies will have to get back the money they will have spent, not only on spectrum licences and new hardware, but (presumably) on higher bandwidth links to base stations, and definitely on internal core network link upgrades and associated posh core hardware.