I was discussing this thread with my DH last night, and he of course had a similar reaction... we're not pg so it's all hypothetical anyway but he was shocked (I think it was the graphic idea of baby floating in abdominal cavity... it's a scarey, scarey thought).
But I guess the part of the conversation that summed up how we REALLY see it is this. Catastrophies happen to people. There are many kinds of catastrophies - car accident, plane crash, untreatable cancer, death of a child, and there's no way to predict whether or not you're on that "list" of people who are going to experience a catastrophy. There are ways to shortlist yourself though - driving a car you know is unsafe, smoking, and IMO signing up for almost certainly unnecessary surgery is a way to shortlist yourself for catastrophy (of course erc is not what we're talking about here, I know, I'm just following the train of thought through). I guess the question really is, are you likely to have a successful vbac in hospital (with your MW certainly ups your chance of success)? If I had this option, and all else being equal, it is probably what I would do.
But, I'm in a similar situation where there is no perfect solution. The hospital where my MW has priviledges demands that MWs transfer care of all vbac clients to the on-shift OB upon arrival. So I don't have the option of MW-attended hospital vbac, despite that this is what would fit for me. We also have no birth centres, and will be living at least 40 minutes from the nearest level III hospital by the time I'm pg again. So I believe I will be forced to find a way to become comfortable with an UBAC (because I have precipitous births, it's likely the MW won't be there yet), which is not a choice I would have made in any other set of circumstances.
But, when I come back to it... if I'm on that list of people to whom catastrophies are going to happen, well, I'm on that list and I can't do anything about it. I believe that walking into that knife-happy hospital to vbac and getting turned over to an OB is little different from signing up for erc, and I believe that THAT would be shortlisting myself, so to speak. so unless things change - we'll be staying home. (and then of course there's still teh precip birth factor to add in for me... could we get to the hospital, even if my MW could attend me there?)
anyway I'm blithering now... hope some of this is coherent!