Verizon AWS is 2*20, which allows for much greater thoroughput than the 2*10 they're running on Band 13.
But yes, the really important element is system-wide, not per individual device. What we're talking about is actually being able to use LTE at all hours in Manhattan, not being stuck on 3G half the time during the day because the towers are overloaded.
EDIT: the main worry, of course, is the software update. Will the new radio require installing a fully secure bootloader? I don't *think* they can make that happen, but I'm sure they'd like to try.