I will be making an entirely coincidental tour of ther top 3 MW contenders for the 2017 US Open. A week ago I played Olympia Fields North, and later this week will be visiting the remodeled Cog Hill and updated Erin Hills. My impression going into it is that Erin Hills, notwithstanding its intial failure to think outside the bun, is the leader based on the quality of the terrain and elasticity the course and grounds provide, with OF 2nd. I haven't been to Cog Hill in many years so I am intrgued by the opportunity to compare all three within a short window of time.
Geoff in his article notes the renovation to the South Course at Olympia Fields warrants a look from the USGA for future events. I can report that in the Mark Chaplin organized Royal Cinque Ports Tour 1909 -2009 US Tour which visited OF ten days ago, the RCPGC members were quite impressed with the South Course, and enjoyed playing it more than the North Course. I'm not saying that makes it a US Open contender, I think OF North still presents the stiffer challenge to the better player, but well done to Jeff Goldman and OF for their improvements to the South Course. The par 3, 4, 5 5th, 6th and 7th holes at OF Sourth is a sublime sequence of holes.