Regarding habitat, I think the assumption that suitable habitat has decreased is based in a flawed, subtly anthropocentric, view of what that habitat CAN be, which, in turn, is rooted in ape-camp thinking about what sasquatch is. One of the questions we should always ask is "If I went feral, where would I get resources?" The answer could sometimes be "just as far from other people as I can get", but at other times, the availability of resources which are just cast-asides from the general population may be the difference between life and death overriding the urge not to be seen. Thus we have reports of dumpster diving, crop raiding, etc.
I have to agree with LCB, though ... for the most part, sightings are closely related to contiguous cover, water, food ... travel corridors if not home areas. Occasionally there's an outlying, non-conforming data point. Those can be interesting to study. They might be hoax, they might be misidentification, but if legit, they might give us deeper insight.
MIB