Whilst learning disabilities do have a hereditary factor, Dyspraxia is definitely not a dominant gene, so the chances are likely 25% or under. Also, it has been argued before that ASD may have been useful for evolution due to discoveries being made by high functioning autistic people.
I've always wanted kids, so I find the idea that we shouldn't have them due to the chances of our condition being passed on sad and I totally disagree with the notion. Still, I respect anybody's decision on whether or not they would like to have children, of course.
As I've said before on this forum, I rather not pass on my Dyspraxia to the next gen. While I know there is a chance it wouldn't get passed on. But I think everyone would agree here. That if we all had kids then we would want them to grow up without the struggles we had.
I can see merit in both of your perspectives here. I suspect a lot depends on the extent of the dyspraxia that you have. Some dyspraxic people are comparatively mild cases who with a bit of extra effort can do virtually everything that 'normal' people can do. These people probably feel no hesitation in having kids than any other people if they want them.
There are, however, other dyspraxic people (hopefully a minority) whose condition is severe enough to make all aspects of their daily life a major struggle despite their efforts. It is understandable if dyspraxics in this situation are hesitant about having children since they might feel doubtful about their ability to take care of them, (irrespective of whether the condition is passed on) especially if they do not have an extended family to help them out.
Overall, I would never want to be the judge and hury about this. All any individual can do is think carefully about the question and make a decision on his or her own terms. Since I'm no lover of kids, my dyspraxia has never been a factor in my decision to be childless!