Something is rotten in Denmark when looking outside for things like the ones you mentioned is needed.
Well, yes. That's my point: that many aikidoka are not aware of their training assumptions and blind spots.
As it happens, I've been fortunate in that the dojos where I've trained have always had a decent number of people with training in other arts. I got smacked in the nose by a karateka just the other night, in fact. Totally my fault, and a valuable reminder.