Before including this genre in a discussion that mainly resides within the realm of genre and musical conceptualizers, I would wait for a few years to see if MetalCore can gain a long standing influence over several other styles, the way the aforementioned bands and genres have. as it is right now (as Mr. Lazurus knows all to well from me), the genre is little more than a commercial hybrid that is going to have a fairly low shelf life and little impact on Metal, beyond appealing to the teenagers who are rebelling against the midnight curfew and push their plates away from the table because they hate the brussels sprouts.
I don't see any upward mobility for the genre as a truly viable and longstanding style, but we'll see if anything can really rise up as a concept leader and bring some good things out of the genre.
I kinda agree with that. In five years, metalcore will be a blip on the map, leaving just the bands that had a solid touring history like God Forbid and Shadows Fall around, with people talking about when they still were cool. Kinda like how people treat Nevermore and Overkill. All the crap, like Atreyu and the current incarnation of Killswitch Engage will still be around but no one will care.