I intend no slight or derisory comment when I say that the little bits of sword work seen in Karate and Aikido dojo do not really represent what the JSA are like. If anything, they represent what a bad swordsman would do, for against a good, properly trained swordsman, many of the anti-weapon techniques are a last ditch effort when you have nothing to lose by trying i.e. the training is for those occaisions where you have a chance of success.
Hi Sukerkin,
I suspect that legitimate Aikidoka will take exception to part of your comment.
For context, it's worth noting that the founder of Aikido, as a licensed teacher of Daito-ryu Aikijujutsu, had considerable experience with the sword. Also, the sword art Ono Ha Itto Ryu was an integral part of Daito-ryu training in those days. In fact, Tokimune Takeda said on record that one cannot learn Daito-ryu without a thorough knowledge of the sword. His father, Sokaku, was a very accomplished swordsman, and was the primary one who integrated sword work into the unarmed techniques of Daito-ryu.
Many of Daito-ryu's techniques were originally defenses against sword attacks, or against attempts by an attacker to neutralize your ability to wield your own sword. Again, for a bit of context, when you sit in seiza in Daito-ryu, you fold your thumbs into your palm, to protect them from the tactic of severing the thumb to prevent the enemy from being able to use his sword.
If you'd like to see an example of fine integration of sword techniques into an art that is closely related to Daito-ryu, search youtube for clips with Don Angier sensei, the headmaster of Yanagi ryu. There's one from the 70s that includes sword offense, sword defense and unarmed techniques against unarmed enemies, and against sword attacks.
I'm not familiar enough with modern Aikido to comment on how it has evolved from its origins, but Ueshiba's original art definitely included viable sword defenses and influence from offensive sword techniques that are representative of what was going on in JSA during his time.