I think that it all has to do with the wrestling fans today as opposed to the fans from before. Nowadays, there are a lot of kids that watch the WWE as opposed to before and they can't stand to see one wrestler holding the title for any longer than 3 months, unless it's someone they are able to admire, such as John Cena, C.M. Punk, Rey Mysterio, etc. So that could be one of the main reasons why WWE has so many title changes so often. There was a time when wrestlers could hold the title numerous times and still have every title reign have a lot of meaning whether the reigns were long or short, but nowadays, that is not the case. You have John Cena with 4 title reigns, all of which held a major purpose in Cena's career, same with Batista, and Triple H. Then again, you have wrestlers who hold the title multiple times just to lose it to someone shortly after, such as Edge or Chris Jericho. So, you could have a lot of title reigns and be a bad champion and you can have only one reign and be considered a great champion. It all depends on how you are booked as the champion, whether it's a dominant one, an underdog, or whatever.