Anybody looking to compete seriously should compete in serious marathons. Disneys is meant to be fun. Yes, its accepted as qualifiers for Boston but even you have stated that the first mile of the race can dramatically skew your times due to all the people. That evidence alone shows that if a serious runner wants to submit a qualifying time for the Boston marathon they should NOT use a Disney marathon for that unless your starting at the head of the pack and can avoid the masses that are walking. Disney marathons have become so popular that its very difficult to finish in a time that accurately shows your best time. Should Disney change anything? Absolutely not, in my opinion. They are popular and it allows people who would otherwise avoid marathons to experience one, and ya, it looks like fun to get all dressed up in a crazy outfit.You are confusing "fun" with "not serious". There are many, many people there that consider it a serious race. Disney does TONS to ensure people looking to run the race in a serious fashion can do so. Just because people dress up in costume doesn't mean that it's a throwaway race. The Disney World and Disneyland marathons are accepted as qualifying races for the Boston Marathon. That's serious.
As stated many, many times. They go to lengths to ensure people can run at their own pace. It's just not quite yet great. I'm using my W&D 1/2 marathon time as my corral submission for the ToT 10 miler this year. I hope to run faster than that pace by quite a bit, and if I get there, I'll ensure I have a proper qualifying race to move me up to another corral. Too many people looking to run slower times are in corrals up front. If they submitted a time that they had no intention of running, I don't know what Disney could do about that really. If Disney is not quite rigorous about checking the validity of submitted times, that's something completely different.
If this were a race that were something I didn't take as a serious race, I wouldn't pay the price I will be paying to go down and run it. Just because it happens to be a hell of a lot of fun doesn't diminish it's seriousness.
I take my running VERY seriously and strive to get the most out of each run/workout. I have never competed in any marathons because I run and workout to stay in shape and feel good. I dont need a medal or a free t-shirt or the approval of complete strangers Im competing against to know that Im in shape. Im not knocking those who choose to compete either, I just choose to compete against myself. If I do ever decide to run in a marathon it would probly be a Disney one because they look FUN. If I wanted to be taken seriously, I would run a different marathon.