Our OB discussed VBAC at the first appointment at 12 weeks or so. He didn't even bat an eye when we asked to talk about it and was very supportive and matter of fact (We also have a midwife, but have to have high risk OB due to twin pregnancy VBAC).
Even with twins, our OB is very supportive of trying for VBAC. He doesn't see any reason as to why it would not be successful. He feels it somewhat depends on why our first failed to progress but also said there is no real way to know why she failed to progress. We feel it was because of induction causing her to change position during labour and then not be well situated to keep dialation progressing.
Our OB gave us very good stats on chance of rupture...0.5%, which included all types of rupture. Only 5% of those ruptures being significant. All this is even with twins.
What increases the risk dramatically is the use of cervidel during induction. And the use of pitocin in any med to high dose could increase risks.
We are feeling very good about the chance of VBAC and this doctors skill and willingness to do it.