Core music are too mainstream, too influenced by other genres.
Hardly our metal that we actually hear. Nope, Lamb of God is nowhere near metalcore. Some listings are just too stupid to point that out. Lamb of God has created a genre out of its own as it is very unique. But I would see it as technical death metal. But really, Randy's voice is simply good.
Metal is still there, don't worry people. There's still Slayer, there's Opeth, there's Lamb of God, there's Cannibal Corspe, there's Dark Funeral, there's In Flames, there's Arch Enemy, etc.
It seems, unlikely, very unlikely that our metal which we had learnt to appreciate would die down in the hands of metalcore, hardcore, emocore, etc.
Rock on, metalheads.