Hun only you can know what you're able to live with and what you will probably regret. I agree with Sarah's post but of course, it is really your body and your choice. I wonder why your logical mind says go with this Friday? Your heart sounds like you want to leave it until the 4th Jan and give yourself every chance to VBAC. (Just my reading of your post).

I agreed to an induction on a Friday afternoon (scheduled for the Monday). I thought about it over the weekend and felt a bit like you. I was pretty uncomfortable with rushing, I felt I was being rushed and I felt a bit pressured. I negotiated to put the induction off until the Friday and bought myself another 4 days. The next morning, I went into labour spontaneously. I still ended up with a cs, but I know I gave myself and DS every chance to do it vaginally and I laboured for a long time naturally which I will always be grateful for. I think if I'd been induced, given what eventuated, I would have been guaranteed the cs and I wouldn't have experienced labour like I did (at home, drug free etc).

Not sure if my experience will help you at all but I am really glad I had a couple of days to think things over. Take the next day or two to decide. You'll know what's right.