I think you hit the nail on the head. I think by combining the arts he did, Mochizuki Sensei did a great thing. One of the problems I see in aikido is that it is **way** to easy to get away with crap that would get you pounded in karate dojo, and slammed in a judo dojo. But in too many aikido dojo, you can pontificate, throw a cooperating partner, and pontificate some more. Not enough reality check. And I've caught myself (and been caught by others) doing some pretty silly things on the mat, so please don't think that I'm leveling this at everyone else's dojo or style.
But that said, I still prefer the aikido...I wish I had done judo as a very young man, and had 20 years of aikido, instead of seven.
I think there was an article in JAMA about the education level of aikidoka being significantly higher that in most other martial arts. I'll see if I can find the article. I'm no statistician, so...