I want to think that the course maker might find its way into the Academy somehow. Maybe custom tracks for the finalists to race on?
Could be interesting. And, yes, I'm VERY optimistic about this!
For GT Academy, I doubt. Final event will take place on a real-world track.
But it's not impossible that the course maker will be available in the next update.
PlayStation Gran Turismo forum moderator (MasterGT) must know more than us, no ?