Yeah, it doesn't matter that HSPA+ can scale to silly levels and that it is already faster than a lot of people's home connections.... It's not 4g!
Then again, neither is the current deployment of LTE.
Right you are. But the difference in spectral efficiency is significant to the carrier (and the user, if the cell gets congested). It takes a crazy amount of spectrum to get HSPA+ to 42 Mbps. LTE takes a lot less.
LTE also wins for uploads and latency.
HSPA+ is at the end of its road. LTE is at the beginning of a new road, and will eventually scale to well over 100 Mbps.
In about 5 years, LTE will also start replacing the current voice networks. Once they can turn down/off the current voice networks, that makes room for even more LTE. WOOT!