Once again, thanks to all who have contributed.
To CStrange and David Tepper, I read the suggested articles (one by our own A. Pioppi). In general, I am less impressed with successes in central and southern California, though some of the results of the Logan (Greenway) system have been very impressive. In Minnesota, I believe bentgrass holds its own against Poa quite well, due to the temperature extremes.
I don't have an axe to grind here. I am an interested golfer who enjoys the quest for ideal playing surfaces. If anything, I suspect that a natural approach, allowing a region's dominant grasses to dominate and thrive will work best in the long run. I also suspect that the use of herbicides and other growth and seed limiting chemicals has a mild but lasting detrimental effect on the environment.
Here in the Pacific Northwest, I haven't seen any success stories, so I'll probably head over to Heron Lakes and have a look. Bend, Oregon gets far less rain, and may be able to keep the Poa out. A trip to Pronghorn would be educational. Two very nice golf courses a bit too far from town.
Finally, it was frustrating watching the putting during the U.S. Open at Chambers Bay this year. I saw the 9th green close up after play one evening; it appeared to be 30-50% Poa in the areas I scrutinized. With everything at stake for the course and the host governing body, you would think with all that money and know-how the greens would be smooth for four days of tournament play. Even at their worst, Pumpkin Ridge's greens never experienced that level of inconsistency of roll. In my opinion, the problem was the initial decision to have fescue greens, which appear to transition to Poa in a less graceful fashion than bentgrass. As the science evolves, it appears that fescue fairways and bentgrass greens is the way to go.