First of all, Âµtorrent 2.2.1 build 25302, small, effective, no bloat, good functional design and includes advanced options.
I think you are both right... Whenever a public torrent site gets too big and is not built on a decentralized infrastructure with several servers/locations like Pirate Bay, they come above the radar and gets shut down, but new ones do pop up.
Unless you are active in the forums/IRC, you may miss comments about where to go to next and if the new tracker is private which seems to me to be the trend, you also miss the opportunity to register for free.
It is as hinted above, all a question of politics even for trackers... Stay clear of EU, US and live long, go private and live even longer.