I kind of don't get why everyone's going "ZOMG GS REMAKES!!!!111lol1!". I mean, sure, we may actually be able to legally obtain Celebi, but at this point, I don't think a lot of people care. I'd only be hyped if they're remaking it once the 5th gen comes up, and they put 5th gen Pokemon in it. THAT seems worth it.
As far as getting Pokemon goes, in some way, shape, or form, you can now catch or get them without the use of a GS remake, and thanks to WFC, if you need a particular Pokemon, just ask and get it. I can see a use for getting TM's that are somewhat rare or hard to find or something, but there's already a cloning glitch out there, and WFC again trumps the point since you can just ask for a particular TM.
If they remake GS and put 5th gen Pokemon in it, as well as increase the relative map size to include Hoenn and/or Sinnoh, and allow Celebi to be caught, I wouldn't mind and in some ways be excited (I stopped playing Pokemon awhile ago, so that's kind of a shocker). It would have even more things to do than before, and it would be pretty fun.