Admiral James Kirk wrote:
How is it that they aren't doing this right now?
One of the key points of Batman Beyond is that we have the legacy right there in our face, with Bruce Wayne as McGinnis' support staff. We accept McGinnis because Wayne has given him is blessing and costume.
Showing Bruce Wayne alive in the future can be seen to negate any sense of danger the character may face in a film series set 'now.' Part of the thrill is for youngsters to believe the villain can kill Batman during the battle. That thrill is gone if he is shown alive in the Beyond movie the kids saw six months ago.
Yea, each film series having its own Bruce Wayne may negate that, but that would only confuse people about why there are two Waynes.
At least the way studio execs would justify it.