Something like that was discuss a couple of months ago. The quest is the same as the op and in some of the linked pages extended from WGT Media to the PGA site we talked about that add a single course, no metter if stroke or closest, per year it would be a good start even, an excellent start. Valhalla is a project done and I think that during this year we could have a new course if there were not so much issues as the ones each new release. Pebble Beach is under construction but it will be full 18.
Probably next course will be a closest and I would like it for sure. The activities advertising from WGT and Partners is a process that cannot be suggested but only well-advocated for daily players, the registered cash doesn't care if you are a multi, a cheater, a sandbagger or whatever else an account represent while is online.
Just a thought.