this show is different from any other "reality" TV show. These Survivor -type of shows, where somebody stays on an island, or when someone marries a millionaire, or people figthting over a million bucks, thats the kind of shit that gets old real fast. American Idol is about music, plain and simple. Music has been around since the beginning of time, and will always be around. Music makes the world go round. Music is a constant in life, and this show allows you to learn about tomorrow's music stars and watch their careers unfold right before your eyes. This isnt some Mickey Mouse music competition where the winner gets a cash prize. These people end up on the radio, and it's the only reality show that turns out to be real in the end and have an impact on people's everyday lives.
20 years from now? I dont think so. I imagine this show will die down a bit when Simon moves on. Plus, you dont know what technology will be out 20 years from now. But they will continually find replacement judges to Paula and Randy. Being a judge on AI is turning into a nice job. The show is a cash cow, and they'll find celebrity replacements for Randy and Paula and pay them a hefty amount. But they'll need to find a genius idea to replace Simon.