Well that's how it works for the successfull companies. They focus on their target market, that is the people who can and want to buy their products. Porsche enthusiasts wants the design of the 911 unchanged and that's how Porsche has kept it. It is not about what you can or want to produce, it is all about why what the market wants.
It is very important to listen to market and the consumers. Manufacturers which have failed to do so are Volvo, GM and Ford to some extent, which is why their sales are dropping faster than Britney Spear's hair when she trimmed it off her head.