The R5 isn’t a concept car anymore but one of Renault’s best sellers and it is extremely close its concept car version. Same goes for the Renault Twingo.

That said, the 2CV concept car looks like it would have to change more to become street legal and a reasonable product.

The 2CV is already scheduled and will sell for €13K.

Sometimes concept cars manage to get through relatively unscathed.
The Renault 5 and the Renault Twingo revivals spring to mind.