Not wanting to start an argument, rather, just making an observation, but I personally know quite a few (including myself) who have incontinent spayed bitches.
Now I need to qualify this by saying that I do not feel that a risk of incontinence is a valid reason not to spay, as most times, it is minor and completely manageable (I use parsley to control my bitch's incontinence), but based on personal experience, I do know of quite a few people in show circles who have incontinent adult spayed bitches (some are on DES some are not, some use parsley as I do).
I also want to point out that I feel that there is way too much information *supporting* spaying/neutering and not enough presenting the other side of the coin. In fact, there are a very select few (including the one above). I do feel that people have the right to hear both sides of the issue prior to making informed decisions. Having said that, this is the part of me that wishes to encourage owner responsibility (ie: doing a bit of research prior to making a decision regarding their pets), which the US seems to have a general lack of these days.
Bottom line is that I feel that our pet population issues is an owner responsibility issue, not an issue of whether a dog or cat retains it's reproductive organs. And I feel that it's only through education that we can at least try to remedy this issue.