People who come to watch Wonder Woman want to see the Wonder Woman they are familiar with.
If she does appear in the JL movie, it'll be her first major public exposure in nearly forty years
, and whatever origins/everday SOP the Carter TV series gave her are so obscure and forgotten even I
haven't really gleaned them via cultural osmosis. WW is a nearly blank slate. Unless super-careful and thorough movie coordination is in place, I think it'd make very little sense for a mere CW series to interfere with perhaps the WB's most significant in-development project.