Eddie,

Since you used driving for comparison to playing music, I'll continue with it. Some people just want to learn to drive so they can pick up their girlfriend and take her to the movies, ...maybe even get a good night kiss. Others may just want to be able to go to the grocery store and get to their doctors appts. Race car drivers want to go around in circles at mind numbing speeds while risking their lives to do it.

Simple play along programs are great for millions of people to learn some basic skills. It also does something even more important, ...it teaches them music appreciation. Once they realize how hard it is to play and sing a few simple tunes they'll have a much greater appreciation for the music they hear played by professionals.

Any of them who want to advance will do so by studying theory and finding out why certain things sound good while other things suck.

I would never want to discourage anyone who is happy playing "Amazing Grace" to a play along video.

Bob
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http://soundcloud.com/bobcflatpicke/music-in-the-mountains