I'm Canadian, I get DSL through a dry loop (phone line, with no actual phone service). I was under the impression dry loops were available everywhere, maybe not though.
As to the popularity, I know very few people young enough to have had a cell phone in high school who now have a landline. I know very few people outside of that group who don't.
The people outside that group that don't are often in the category of moving outside their current city after they got cell phones. When you're going to have to change the landline number anyway, and notify all your friends of the new number, and they already all know your cell phone....
Most of the over-25s I know (myself included) that don't have a landline ended up dropping it during a move.
As to the popularity, I know very few people young enough to have had a cell phone in high school who now have a landline. I know very few people outside of that group who don't.