I chose nay for Wilson...although it really is a tough call. One thing i like about him staying was the fact that it was Blackwater Park that introduced me to Opeth, and that happens to be the first album produced by Steve Wilson. That said, Deliverance (while still a fine album), was the biggest dissapointment for me, and it just appears to me that the depth and aggressiveness in Opeth's music has been lowered rather considerably with Wilson's presence, and it's clear where that influence has come from. Whenever i hear mellow opeth bits, i hear Steven Wilson...i want another Requiem, or Benighted!!!
However, I say we give him another cd or two before we can really judge him, since he's only done 2 heavy albums with Opeth. Either way, there is no way Opeth can shake off his influence on them, even if he does leave.