I remember back in 1988 they threw a pretty big celebration for Mickey's 60th birthday. While someone's 60th birthday might not be a big milestone, the 75th is a huge milestone. So I calculated it out and Mickey Mouse would be 75 in 2003. Here we are in 2006 and for the life of me I can't remember even hearing a mention of Mickey's 75th at Disneyland in 2003. It seems to me that if they threw a huge bash for his birthday at 60, they should do something incredible at 75.
In 1988, there were only 3 Disney parks in the entire world and Disney didn't even have a contract with Pixar yet. It seems to me that Disney is more obsessed today with their global parks and Buzz Lightyear tie-ins than the one character Walt Disney himself told the company, in no uncertain terms, to never forget. I personally am sick of Buzz Lightyear, the character is so one dimensional (no pun intended) and relies on catchphrases and marketing. The Fab Four have been around for many decades because they have personalities, and Disney seems to be brushing them aside for Pixar's characters which I think is very wrong.
As for Mickey, there's always 2028 when he'll celebrate his 100th birthday, but will Lasseter and Jobs be around by then? The 100th birthday celebration of Walt Disney was quite amusing (in a tragic irony kind of way)...Walt Disney World, a park that Walt never even saw, got all of the attention while the one park in the world that he personally supervised, built and lived in was suffering from neglect. So hopefully Disney will have its act together for Mickey's 100th birthday.