I was thinking about this the other day. Here on Micechat we poke fun and joke about other parks that try to copy various aspects of Disneyland. However, when Disneyland decides to potentially copy something the response is usually "well it's a good idea and Disney will do it better". It's a frustrating bias, but worth noting specifically for this instance. SunWheel was based off of Coney Island... not bad... turned out nice... then Al noted that John L. wanted to rip out Maliboomer and toss in a Parachute Drop. Currently that idea is being shelved, but most on here never even brought it up. The reality is Walter Knott "borrowed" the idea from Coney, and now Disney wanted to "borrow" it from him... But when you consider Maliboomer itself was a cheesy rip then things begin to make sense.
So the question arises, should Disneyland borrow and improve upon the ideas, concepts, and ride systems of other parks... or should it simply drive it's own course and be original?