AH,
If you're running fine, no injuries -- great. What do I gain by trying to change your thinking? Do I think that it is an avenue that you could explore to improve your performance? Sure -- it's like eating right. If you want to cover all your bases you cut out the processed stuff. That doesn't mean that it's impossible to run well if you eat Oreos, but they're not doing you any favours.
As you said, you don't have (or see) any motivation for going to less shoe. The time it would take you to transition isn't worth it given your skepticism for its supposed benefits. That's fine.
I never had a training related injury in the Kayanos, but my calves sure as hell hurt when I wore spikes. So I made the switch and am happy with my progress.
I freely admit that El Guerrouj and Radcliffe and others run in shoes that I wouldn't recommend them. I know that I sound arrogant when I say that, but as I wrote above, it's a part of maximizing every avenue of training.
Here's an interesting question: if more elites, in addition to those from Japan, trained exclusively in flats and bucked the trend of their manufacturers, how would your opinion change?
and BTW -- yep, should race in the fall.