As I understand it, there are a handful which remain, working towards wholesale corporate reunion (which is likely a bridge too far, at this point), but the creation of the Ordinariate has largely removed the reasons for their staying. I recently read a really interesting book on the topic, which I'd recommend if you're interested.
Edit: Also, and particularly with the advent of the Ordinariate, Anglo-Papalism strikes me as an ultimately untenable position. To accept the Roman Catholic position seems ultimately to accept (among other things) the necessity of unity.