Rogers already does this (cripples download and limits upload to ~80KBps). They've forced me to switch to Usenet as even popular Torrents slow to a crawl on their Ultimate plan (50 down/2 up).
There's also the possibility of a 'seed box,' a remote server that downloads your torrents, then you just directly download them to your local machine from the server. I've heard of them (mostly through reading articles/comments on TorrentFreak), but I've never been curious enough to investigate the economics of them.
Curious why you would move to Usenet unless you are using a free service? The remaining DDL services (such as DepositFiles and RapidShare) are cheaper and tend to have faster DL times. Something I'm missing?
I pay less than $7/month for my Usenet connection, which is relatively cheap if you use it frequently. The connection is over SSL so it's completely secure end-to-end. My average download speed is 9 MB/s (saturating my line) which means I can download a 720p HD movie in just under 13 minutes. There's also (like with torrents) the ability to set-up TV show RSS feeds, so my shows automatically download to a folder, ready to watch, as they're released. It comes down to ease of use.
Megaupload was taken down and people are leaving DDL serves in droves. Usenet is a relatively safe, very fast, and a service thats been around for years.