It's a possibility.
My doctor told me I have about a 20% chance or less of a successful VBAC because of the reasons for my first C-section. I could not get him OUT! But, I was induced and had an epidural, and I am told by others (not my doctor) that could have been the reason why. Don't know. I was ONLY considering VBAC, but now I could be facing down a C-section for the second time.
I'm not looking forward to it, in fact I am up nights worrying about it. But if it means a healthy baby and healthy me, then I guess I will think it was worth it.