sounds like metal_wrath logic to me
All joking aside, Opeth could be classified as "Crossover" in regard to heavier genres of metal and say other types of music that are loaded with mainstream artists/bands. I guess that I'm a perfect example of their crossover-ness...I like all forms of music/genres and before discovering Opeth thru Porcupine Tree, I was listening to a lot of guitar driven blues, rockabilly, and surf-noir type stuff..and my staples of jazz, jazz fusion, new-age etc...and after hearing Opeth, I fell back in love with the progessive nature of their song structure as well as the uber cool totally unique sounding guitar riffs but I hated the growls...but now I love them!!!!
Since, I've found some other metal bands I like, like Katatonia, Arcturus, Isis, Noverbers Doom, etc...and a lot that I don't, like maybe Canabal Corpse as an example, with their speed metal and blast beats....sorry, it just sounds like a cacophonous racket to me..I require an assemblance of melodic structure to my music.....but the somewhat ambiguous meaning of my original post was that....let's pretend that Opeth's new album is an epic masterpeice, say, Dark Side of the Moon epic, and skyrockets to the top. I fear that many of the old fans would turn a cold shoulder towards them for becoming too mainstream. Kinda like Metalica's fans did with their release of the black album...and I believe Opeth is good enough that this could very well happen if they chose to write in that direction.
Irregardless, if you follow the development of Opeth's writing styles, they seem to be headed towards a slightly more mainstream direction which I personally have nothing against.