IMHO, Six Flags is looking at a primarily local market for each park; therefore, standardization maximizes profits, minimizes costs, and doesn't hurt the gate. It misses the fact that not all of its market is local; there are a lot of us "travel wherever and visit all the parks possible" people out there. For us, standardization is not advisable, as there are quite a few of us who will skip the third (or fifth or whatever) Six Flags clone park if there is any other alternative -- just to get something different.
IMHO, Six Flags would do better to concentrate on the idea of diversity within standardization, and use standardization (perhaps) in training, facilities, management, marketing, etc., but keep the distinct and different flavor of each individual park in terms of theming, rides, merchandising, etc. This would not hurt the local market (and perhaps help, by adapting to it instead of vice-versa), and would certainly increase its popularity within the "avid fan" group.
