Well BitGamer and UnderGround Gamer aren't going under anytime soon, nor theisozone.com. I think Tor is the next step, as we can easily go underground like SilkRoad and use Tor for magnet links. From there it will be harder for US authorities to bust, as Tor is pretty secure and if a site is busted, it will merely encourage Tor developers to expand the network. There is always Usegrab as well.
But I won't deny my piracy habit, but I never pirate actively sold Amiga software as that is cruel. No I use it as try before I buy and if I like it enough I will buy it if the price is reasonable.