My DS5 was like that, too! He didn't PT until 3.5. I am absolutely convinced that the only reason he did was because I was at the end of my rope and just flat out refused to ever change another diaper on him. It was a battle of wills and I think the maniacle glint in my eye told him it was one he couldn't win, LOL. Even still it took 5 days of solid resolve (and lots of Resolve) for him to believe me that PTing was the only way to get me to stop carrying him to the bathroom every 10 min and interrupting his play. I joke that I nagged him into PTing, but it's actually pretty close to the truth.
FWIW, my DS7 and DD2 both PTed right around 2, so you're not doomed to only having hard to potty teach children
Good luck!
