+1 on the F40 example. Other examples include: Porsche 993, Corvette C2 and Jaguar E-Type. All were replaced by "more advanced" vehicles. And none of those replacements have held a candle to the value of their predecessors. The next mid-engine Ford (remember, it might not even be called "GT") will likely be very cool. But between legislative, emissions and safety requirements it won't be a "replacement" for what Ford did with the 2005-2006 GT. I think we'd all agree the styling alone will be nearly impossible to eclipse. Someone already used the "lightning" and "bottle" metaphor in this discussion, and they are right.