It doesn't matter what label they sign to, Mikael, Peter, Lopez, and Mendez will always make good music. Maybe it won't be the same as their old, "classic" albums, maybe it will. No matter what, Opeth is Opeth and they will come back and rip your heads off.
How many good bands are out there? Are they all on the same label? No because they sign with different labels to get certain things. Obviously Opeth is interested in Road Runner, so fucking let them. You should all just go post on one of those forums where they talk about how bands used to be so much better on their early albums. Shut up.