Re: Robin in a Batman movie
I don't think a Batman set in the 30s or 40s would work for me (it'd make the Bat-technology a bit less plausible and more out of reach.) But I'd like to see it in the present with Gotham having a stylized look of a gothic 1930s/1940s. Just like I'd like to see a Superman movie set in the present but also with style inspiration of mid-century Americana.
Just because it's futuristic doesn't mean it's practical.