Well, hams are doing their thing on their bands, and if somebody comes in and stomps all over the bands (
cough WINLINK
cough) it's kind of a dick move. Luckily, most of the ham bands are so low in frequency that they're not really suitable for general Internet access.
2m could get you dialup speeds over a pretty wide radius with some cheap equipment. Get a directional antenna and a hilltop repeater and you'd be in even better shape. The FCC absolutely could shave off a small chunk of the 2m band for encryption-OK Internet links (say, as a way to link up smaller wifi nets), but you're right, most hams would kick and scream even though they all just sit idle on whatever local repeater. And I'd have a hard time blaming them (I'm a ham myself) because they do not want to set a precedent of losing any band space.
High-power wifi is allowed with an amateur radio license, but because you're operating as an amateur licensee you're not allowed to use encryption, so you can't use it to e.g. bring Internet access to a remote RV park.