"worthless" is pretty harsh. They will still be(and are, even now) worth some money. modified cars will almost never be worth what a pristine stock example will be, regardless of the make or model
@s2kx4 I agree with @ten_second_ride there is a market for skillfully modified Japanese cars. Just look to the Skyline market, well done mods can bring more money than a stock car in driver condition.
For the sake of argument on your value points, I would expect to see NSX values rise proportionally to S2000's if that happened. They're more exclusive and widely accepted as the Japanese super car. Personally, I would be sad to see the S2000 market get out of reach to the average collector. The CR is certainly going to lead the pack, but the S2000 is still a common car, so to reliably see gains like that would be newsworthy in my opinion. Time will tell....
No it has a hard top, though I don't know if this example has it. And it's not called a Club Racer for no reason: the folding soft top only adds weight!