I was just commenting on canalligators comment vs yours dkoloko - probably didn't come out right.
Anyway, I think I agree with you both. I'm not going to rotate the tires, planning on replacing them. And yes, if I was going to rotate to extend their miles I think it makes much more sense if I would have done it along the way. I have been known (by my wife) to wait to long to rotate my car tires
BTW: thanks all for the help in the original question about figuring out tire size options - much appreciated. I'll probably not try all the sizes to see how big I could get - although that makes sense if I had to know. Perhaps a practical solution would be to just move up to the next size 35mm for my next set and use them for the next year.
As to agreeing "with you both", it is not going to save you from a crash from having a blowout on front tire that the rear tire is as worn as front.
As to trying tire sizes, that can be frustrating and expensive. Your rims are standard width touring rims. 35mm tires should be in the middle to usable sizes, ranging down to 28mm, and up from 35mm.