I had never heard of 15" cups before. I had heard expanding cups to like 6" and figured within a few years, we would all be back to missing putts just low side.......
Funny to read the comments. Some of the "purists" here might argue it cheapens the game, as if the manly challenge is more a component than just having fun. More birdies, faster play sounds like it was fun for those guys. I might try it if I owned a multi course facility just to see which was more popular.
Another off beat thought. We have sometimes discussed bringing back the old fashioned notion of differing green speeds for more challenge. What is there was a mixture of cup sizes, either announced or unannounced on the scorecard? How would that affect your strategy in playing for the tucked pin or towards the middle of the green?
BTW, if on another thread, great economic times are the underpinning of building great courses, I gather that bad economic times are the underpinning of experiments to shake it all up and see how we can remake the game.