Yeah you're right about that, i didn't consider that maybe they'll find some kind of middleway to include rayquaza i hope they will, its one of my favourite pokémonTrue, but then again Ho-oh/Lugia didn't have a third member to give a third version to (and HGSS did include the Crystal-specific Suicune sidequest).I dont think it will have its own sequel, crystal didn't have either
As much as I'd love to see Emerald remade, the problem is that Rayquaza would kind of end up stealing the show. I never played original Ruby or Sapphire so I don't have any firsthand experience with its plot, but the fact that Emerald pitted you against both Aqua and Magma is part of what made its story awesome: You had two groups of fanatics warring for control over Hoenn, with you were caught in the middle and fighting them both.