I think it's an interesting story.
I have a hard time believing that an animal that size would be undiscovered. Granted there are some places in Canada and America that are really remote and unexplored but with the sightings so spread out that would suggest a decent breeding population and a large roaming area.
If there's that many of them alive and all, there should be some evidence like droppings, hair samples, a dead body someone stumbled upon in the woods -something. Unless people want to start arguing that Bigfoot is supernatural, I just don't really think it exists or if it does it's a case of mistaken iden y (i.e. a prank or perhaps a human that's withdrawn from civilization?).
That said, given the sheer number of sightings dating back a long ways, I won't say it's impossible. Just highly, highly, highly, implausible to the point where I don't object when people say it isn't possible.
Why?