Anyway, I don't understand what Google is supposed to do if carriers choose to disable it. Maybe customers should be looking into other carriers if they don't like the way their carriers conduct business.
And Google does have some leverage, if they choose to use it, in the Market compatibility requirements --- there are minimum requirements for both hardware and software if you want to get the Market, or Google's other proprietary apps. (Which, say, the Nook Color flunks --- no camera.) It might be a bridge too far for some of the carriers, but from the outside, it's not obvious that they're trying.
(And looking for other carriers is not a hugely practical option in an environment where there are basically four, and the one with the most generally consumer-friendly policies, T-mobile, is up for buyout by the one with the least, AT&T, which is the only one to ban sideloading altogether.)
Last month I went over 5 GB for the first time (5.5 GB) but speeds were not dropped.