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?
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.
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.