While it might sound good it is impossible for several reasons. Reason number 1 is that WGT only has 5 of the holes on here already that would mean shooting pictures of 13 holes on 11 different courses which would be a logistical night mare plus be very expensive as well just in travel expenses. They would have to pay licensing fees to those 10 courses for the use of 1 hole and 1 course for the use of 3 holes.
But the biggest roadblock for WGT is the fact they can't get the rights to use any holes on at least 3 of the courses. Rights to Augusta National and Saw Grass are owned by EA Sports and WGT will never be able to use any hole on those unless EA Sports gives up those rights and I don't see that happening. And The owners of Muirfield would not allow WGT to use Muirfield for The Open 2 or 3 years ago.
So there are just too many problems to over come for those 18 holes to be on WGT in any form except for the 5 holes on Pebble and St.Andrews.