I don't think there's a possibility right now to release them on Blu.
While I agree that a Blu-ray release seems unlikely for the foreseeable future, I've been surprised too many times to completely discount the possibility. For instance, Millcreek Entertainment released the entire MIAMI VICE TV series on Blu-ray only a few months after issuing a series DVD set! In short, strange things can and do happen, on occasion!
That said, I'm not holding my breath, either! If/when it happens, great! In the meantime, I'm happy to have the full 20 Sony DVD set!