I like the idea too, however I cannot see it happening. To do so you would have to join a game with others who want to play in that Tournament, and depending on the times you play you could wait for ages. The programming changes I would imagine would far outweigh the benefits for WGT.
The time it takes to play a MP stroke round with four people is slow and would peronally put me off, especially as you would have all Tiers (the programming changes to isolate tiers would be an additional problem) playing.
Like I said, would be nice and we can dream that perhaps one day.......