What data are you using to support the notion that the course creator / tons of courses are what is making the difference?
The course creator has been there from TGC1 -- the differences now are 2K exposure, Pro golfers, more polish and PGA stuff, gear/apparel -- no?
I confused why, at this juncture and on this particular release, we'd give credit for the success to a feature that's always been there.
I'm not at all convinced that mainstream fans who are into the PGA Tour, real golfers, gear/apparel oriented features care much about "endless courses", so long as they have 20 or 30+ good (ideally great) ones.