As long as the right to censorship is not extended to the celebrities' families, then historical figures (being, in most cases, dead) should be OK. While I agree that there should be some kind of protection provided to individuals regarding the use of their image, but it should be implemented in a way that presents the least opportunity to abuse it. So, it should be specifically tied to the person being depicted, or their legal guardian in case of children. And of course, after death, the permission would be granted automatically (with regards to children that died before their guardian did, the legal guardian should have a say, though).