@Rootage,
Thats true, but bare with me:
If all mobile phone users will use a cloud for their music, and everyone is constantly streaming music from a 3G network, can you imagine the load on those networks? It will be choked before one can spell "not working anymore". The result being that no-one will be able to use the network for the main purpose: calling, or worse, emergency calls...
Than comes the solution: expanding the network capacity. But that will result in people complaining about radiation and cancer and that crap, so that will not (easily) happen.