From what I understand, DHT has a big trade-off vs BitTorrent: DHTs are crawlable[1] and copyright holders can more easily track who holds copies of what yet it's easier to duplicate search engines like TPB within hours for the same reason.

So the effect seems to be that the RIAA, MPAA, etc. will likely not be able to take down trackers; they'll have to revert back to suing their "customers" (or lobbying to pass absurd legislation for that matter).

[1] http://z.cs.utexas.edu/users/osa/unvanish/papers/vanish-brok...