Keep in mind that I don't really like the newer cars, but I accept them.
We have plenty of shows that don't allow the new cars. For the most part, that is done where there is no more room and allowing new cars would displace the older cars. The mistake of not allowing newer cars or having "attitude" towards them was made 30 years ago by the previous generation of car show attendees. Do you see many 30/40/50's car at shows anymore? Other than street rods I mean.
So rather than cut their nose off to spite their face, Carlisle has seen the numbers and know that the metric Challenger owner spends as much or more money once they are in the gates.
To me it's really simple... Don't go look at the new cars and don't bother going into the vendor tents that are catering to them. Carlisle is a big show with room for everybody.
IMHO, that type of cutoff for a show like this would be absurd... We like to include all our friends in the Mopar world. It isn't just about the cars you know....