Qualifying is the best way to go...you could even keep the current scoring average in place for all other tiers.
Qualifying could also be implemented quite soon and by January 2010 we could have a name for that group of true pros…WGT Pro (anything but legend)
That is where you want to be…better prizes, more tournaments (match play?) would all be available once you become a WGT Pro.
Another tier based on scoring average will achieve very little…and mean even less.
There are still quality players who could give a good viewpoint on the original topic of tiers...I hope they respond.