May be I didn't formulated question clear enough - how to deal with the attacks where attacker is committing only real minimum and if attack is not successful disengage immediately? I'd like to discuss very concrete training methods to face such situation.
I got it - it's just by "committed" most Aikido folks mean that silly haymaker kind of attack that's so easy to deal with.
Like anything else - you work up to it, in stages, in controlled situations. Chinese arts have been doing that kind of thing with push hands of various types for...a long time.
Of course, the training method is going to look a little different from conventional Aikido.