The risk overall of scar separation (the term 'rupture' always seems a bit overdramatic) is something like 0.2%-0.5% of VBACs, but that includes any separation at all, not just catastrophic cases. Having a VBAC less than 2 years after your CS does increase the chance of separation but I don't think by very much as the risk of occurrence is already terribly small. The NCT have some very good evidence based reports on VBAC and scar separation so have a look there.
I had an EMCS 5 years ago (only reached 10cm after 48 hours labour, 24 with syntocin, so described as 'failure to progress') and am very keen on a VBAC this time. All of the medical professionals I have spoke to are very supportive, even though I want to have a home birth (which they have also been supportive of). I have had midwife led care, although I have been given the option of seeing a consultant if I wanted.
The consultant midwife I saw said that even if you did start to experience scar separation it is usually a slow process and there are warning signs. If you labour in the hospital I don't see how it could really pose a risk, unless no one is monitoring you properly.
My hospital has wireless monitors so you can move around and go in a birth pool (they used to have a policy that if you had a CS before you weren't allowed in a birth pool but thankfully have dropped that). Their policy is to advise to have a cannula inserted in case you need an EMCS but they do not insist or pressure you as it can be put in pretty quickly if need be. Your new hospital may be similar.
I think it is a bit easy for doctors to advise a CS because to them it avoids the most obvious risk (although not all risks because CS have their own which are not to be underestimated). But having a baby is not like having your appendix removed, it is a highly emotional experience. Also, with any other form of major abdominal surgery you would have weeks of bed rest afterwards, whereas unless you are very blessed with help most women end up carrying on looking after baby and other children plus housework, cooking etc, from the day they get home from hospital. I found recovery from the CS very difficult which is another reason why I am very keen on the VBAC.