Since you've not shared your story, I can only comment generally. However, I know there are many women who have been told their uterus was "paper thin" or "ready to rupture" when they had a repeat cesarean. The fact is that no one knows what a uterus that successfully vbacs looks like, because you can't see it. I have no idea whether my scar area was "paper thin" after my vbac because no one was looking. I don't think that in most cases it's possible to judge whether a uterus is about to rupture, because no one knows what that looks like. AFAIK no one's seen a rupture happen.
Thanks. In my case, I attempted a VBAC and after getting fully dilated and pushing for 4.5 hrs, I had a repeat C-section. It was necessary, and belive me I tried 1,000% to avoid it. I had a large dehiscence from my scar, about 7 inches in diameter, with just the outer layer intact.
Definitely check ICAN. I'm not too familiar with the message boards on the website but I am on their yahoo group, and its a wonderful resource! I know there are lots of moms on there who have had a confirmed dehiscence as well as a couple who have fully ruptured and gone on to have more pregnancies. I'm sure they can be of help to you.