I would say that Aikido is the quest to meet the goals defined in "Take Musu Aiki" by Morihei Ueshiba.
So would you say that ANY practice which strives to meet those goals should be considered Aikido?
Edit: Unless I'm mistaken, this text still has not been translated into English. If this is indeed the clear and rational explanation for what we've all been studying, why is it still largely unavailable to English speaking practitioners? Why wasn't this THE priority for the Aikikai and other groups. Please note, I'm not saying it isn't as central and important as you insist, but since I have no access to it, I'm at a loss to comment on it in a meaningful way. If I'm mistaken and it has been translated, point me the way, and I'll gladly order and read it.