We're just making excuses right now. Gen 2 Music in Gen 3 game has nothing to do with Gen 2 remake in Gen 4. Gen 3 music in Gen 5 has nothing to do with Gen 3 remake in Gen 6. We're just grasping at straws in an attempt to keep possibility alive and we don't even need to do that. They'll be remade when Gamefreak wants to remake them. They may not even drop any hints to a remake and magically create the Remakes when we least expect it.
Right now their focus is on New and better things. When they get over their little fad of speedily creating new things for self gratification and pats on the back to prove that they aren't out of ideas, they'll shift to remaking old games again. Though this can be anywhere between 2 to 10 years from now.
I hope it's not 10 years...1.5-2 years would fit best especially given that Emerald's tenth anniversary is around that time.