Downsides which are often overplayed:
(1) recovery time is often said to be several weeks - in my case it was 24 hours to be up and walking about, 2 weeks to feel fully recovered
(2) not driving for 6 weeks - an urban myth, I was driving after 4 weeks and could have done it earlier if I'd known
I think the only way of really answering this question would be to do a survey of, say, 10,000 women who have tried for VBACs and see what percentage were pleased they had tried and what percentage wished they had gone for an elective Caesarean. I'd love to see the results, but as far as I know no survey has been done on that scale. My guess is it would be about 50:50, which doesn't help flum of course.
By the way pupuce, there is no evidence that C-sections cause women difficulties in conceiving. There is evidence that women who've had C-sections go on to have slightly fewer children, but it's making a big leap to assume that they can't have more children, or that if so the fertility problems are caused by the C-section. I can think of 3 reasons for the statistics: (1) women who have undergone emergency C-sections usually have bad birth experiences, and some of them will not want to risk repeating it (this is supported by the fact that women who've had forceps deliveries also go on to have slightly fewer children), (2) often the reason for the C-section is a gynaecological problem like fibroids or endemetriosis which in itself can cause infertility and (3) often it's older women who have C-sections, and they are more likely to have fertility problems anyway. So in (2) and (3), it's not the C-section which causes the fertility problems, it's the other way round.