No, they only made about 2x as many as the 66 big blocks with the top hp, so Z's will still be very collectible. If a 67 427/435 roadster with matching numbers can go for $125,000 now and they made 4000 of them (and they cost ~4-5k back in the day), they would still be worth close to the same amount if they made 8000 of them. If they made 20,000 Z's a year, then that would really hurt the collector value, but 8000 will still be collectible. But it will be in 20-30 years and also depends on how desirable the C6, C7, C8, etc. are compared to the C5. There will still be people that love the C5 best no matter what the future holds. If you have 4,000 Z's of a given year left in the future (half left), that is only 1 Z of that year for every 75,000 or so Americans (assuming 300 million Americans then). Also, the number of matching number Z's in pristine condition of that year will be a lot smaller than 4,000 by then. Try to see how many pristine matching number 427/435 roadsters you can find for sale now. Not too many.