A remake or remaster is still going to need a soundtrack, and that music can't just be the same as the stuff on the old titles without paying those artists again for the use of their songs because it will need to be licensed for the new platform, it's the same reason that the newer Tony Hawks 5 and Tony Hawk HD both had smaller and more indie music than the original series tracks from groups like System of a Down, The Doors and such, even if they are reusing their own assets for a game, they can't just reuse music licensed for an old game again.

I agree with you about those original games though, I absolutely loved Def Jam 1 and 2 on the GC alongside Wrestlemania XVIII and XIX and those were really great wrestling games, if you had a new Def Jam title with the same high impact and over the top fighting in the originals today against the fair to average WWE game offerings it could do very well for EA, if handled correctly (not a karaoke game)