Yes -- and no. You have to remember that outside of a few countries, unlimited internet isn't ubiquitous. Admittedly, NZ is basically a worst-case scenario (we're connected to the rest of the world by a single pipe, access to which is - was - priced expensively), and we've recently seen an explosion of data caps ($130 for 550GiB from one provider, now), but that's only a very recent development. Some ISPs charge up to $2 a GiB - still.

So, using BT and seeding becomes a less valid option. Still, I'll happily admit that things are changing, and if NZ is a yardstick of the bad, then BT as a distribution mechanism (backed by, say, Akamai or other CDNs) for legal content could definitely take off.