Rod Yabut wrote:
... An alterior motive here is that I will take these observations as recommendations and attend any upcoming seminars these senseis may have while they are still cheap!
I'd go to wichever seminars you want to go to and not worry about whether that person is going to head an organization or not. If you want to go to a Waite Sensei seminar, for example, then go!
Whether he ends up running New York Aikikai after Yamada Sensei dies or not doesn't matter.
More importantly go to the Shihans you mention while they are still alive. They won't be around forever, as you have noted, so get to those seminars while the getting's good.