Phil,
You have a very good point there. Even long standing traditional products are always changing especially as new technology changes. However, the long history, traditions, and success of a select nuber of brands are so ingrained into the publics eye that changing the basic design can be very detramental.
Here's an example;
One of these 911's below is a 1975 the other is a 2007. Why have most of the Porsche buyers "expected" these models to continue to look somewhat alike and have the same basic engine design?
1975 2007
