Just as part of the meeting a future self angle, I would totally mark out if McGinnis showed up. Considering he wouldn't even be born yet in the main U, it has the ultimate built in failsafe.
I don't really follow Batman though other than that. I seem to read all the books from his family but his.
My friends and I were actually chatting about this a while back so I figured I would thrown in that fantasy scenario.
Also I want to add I would be disappointed if Dick was at this point. He always seems to want to move on now and I feel that if all the signs ended up pointing to him, he would defy everyone and shoot down the offer leaving even Batman stunned.
He wants to be his own man, not a continuation of a legacy.