I agree that Uke should help go along with a technique to foster confidence in it, but the student will question the effectiveness of the technique regardless of how well it works in the dojo. The only way to truly prove the effectiveness of a technique to a student is to have them try it on an untrained uke. I don't mean they have to go out and start beating up on strangers- I've found that if, when play fighting with my friends, I use somewhat aiki-techniques(my little brother actually falls from kotegaesh's, which I thought was pretty much impossible in teh real world...hehe...then he bites my legs...to each his own fighting style, I suppose), and they tend to work fairly well(and, being aiki, they have a very low injury rate)
Also, I do think that while we need to learn to use our opponents energy, we also need to learn what the heck we ought to do with a stationary opponent. There will be times when someone is still attacking you, but not giving you any energy to work with. Real world uke will spoil your technique just as often as dojo uke. Thus, you need some way to get them to start giving you energy. When I was no-contact sparring my tae kwon do friend(which is a damned hard thing to do for a aikidoka anyway), I tried to get behind him so I could use the energy of his turning for an iriminage. I found that this could be a pretty effective technique, except that I wasn't skilled enough to find the direction in which his energy was turning. But this kind of technique- that motivates uke to move by virtue of nage's good positioning should be taught more often. We need to not only learn HOW to use an opponents energy, but also how to get them to give us their energy.
Well, thats my very offtopic $.02,
Who doesn't even do aikido anymore, unfortunately.