I just hope that their backbone network is ready to handle those speeds. http://www.engadget.com/2006/12/08/7-2mbps-hsdpa-service-to-hit-cingular-next-year/
I agree, one can only hope. Although I would imagine that Cingular Engineers are aware of that as being a issue that needs to be addressed if not. In which case with the deployment new connections would probably be obtained to ensure that their upgrades go smoothly.
From my understanding is that all it will take is a software upgrade to do this. This will only apply to data cards only.
It is not just a software upgrade if the connections to the cell sites are not able to provide all the bandwidth that the airwaves can potentially provide to the customers. The backhaul connection bandwidth to each cell site should exceed the maximum speed that HSDPA can provide for all channels in all sectors combined, and that's for data only. For voice, the lines are separate unless you are doing VoIP.
For some reson, if any one remembers history of Sprint ads, they always make a push of direct comparison that they are faster than Cingular/ATTW only for things to change soon there after and them end up to be slower because of upgrades byt the Cingular/ATTW networks. I might have misunderstood teh person who explained to me. He basicaly told me that teh next step up in speed only involves software updates. But may these updates would then included the allocations like you said.