I guess I missed the part where you said "southern rock"
I could have sworn your post said "grunge revival"....call me crazy but Grunge was a seattle based sound, I'm pretty fucking sure of that....meat puppets were around before grunge.
And grunge music wasn't a style in the first fucking place, this shit has been discussed to death on this site.
Grunge was more or less a fashion style/ where it was cool to look like a dirty hobo.
The actual music was a repeat of shit that came before it.
The merit of the style was the reason for it's existance i.e. shit going way to over the top.