doubt f0rest will quit with GTR. They've said before, they don't see each other as best friends or whatever like people think, just really good professional friends. GTR and xizt, f0rest and friberg are the bffs :P
Either way, if they quit the scene, I quit the scene, scene is getting boring imo, just a cycle of teams like faze and astralis winning. Imo, csgl going down, was the start of the end of the exciting era of pro cs. Nothing gives that feeling anymore.