The vintage cars were picked up from Loudoun Castle back when they bought Powder Kegs and the rest of Skeleton Cove.
The original plan (2012 IIRC) was to have the vintage cars replace Skate Karts and tie it in with Raptor Attack, which would then form the beginnings a new themed area. With news of dinosaur themed adventure golf and a simulator, I'm guessing the original plans are now afoot. It'll be a shame to see Skate Karts removed, but I can understand it from a business perspective.
I'm guessing the simulator is also why the park placed Whirlwind on the market last year - both to make room for it and provide the necessary funds, as I can't imagine they come cheap. It'll be a fantastic addition for the park though, so kudos.