For me, personally, I'd be delighted to have some really good Rembrandt and Goldie forgeries (that is, copies executed in oils), and maybe a few impressionists. The texture of the works is a big part of the experience. But I'd also like the originals to be available as part of our shared cultural history and heritage, rather than locked in a vault to gloat over.

That said, the shared culture/history is undermined by the way many galleries and museums behave - my wife is a painter and is moved to fury by the way that sketching and painting is now forbidden by many institutions; the artists being exhibited may well have learned their own trade sitting in a museum copying the revered masters of their own era; that options is denied to modern students.