Just to add, in my Sept. 2000 general member (non-Medallion) SkyMiles newsletter:

referring to the "new" Platinum Systemwides:
"...for use on most worldwide Delta flights."

Is Delta trying to put in an "escape clause" to totally limit systemwides on the real big BusinessElite money makers? Go beyond capacity controls, and ban them on select routes altogether? They might not do it at first, but maybe in a year or so, they'll bring out this legalese (similar to United, I think.)