Take a few minutes to think about it, how bad is the break. Last year we were scheduled to go to
Disneyland and I broke my foot. We went back and forth to go or to stay home. We rescheduled until cast came off, about a week and a half, which. The cast came off in morning and we left next day. Pros and con, my foot was still sore, and I had to go for ice a few times. But I did walk okay. If we had went I would have had to be in w/c, but in the end I had to rent one anyway, because my foot was still healing.
So in six days, you are definately loOking at a w/c, and some swelling. In two months, you may still be looking at a w/c and foot will be painful, because it will just be out of cast.
I think your major factor is going to be if you have toddlers, because the foot itself is not really a huge problem, but if you have toddlers and you need two adults than it is a problem.
If I had to do it again, personally I would have just went on the original days. But of course mine was after my cast was on for a few weeks, not just a few days. Either way, it was hard, and my foot was in pain. Actually we arrive on Wednesday night at wdw, and it has been since last sept, and my ankle is still swollen and in pain at time, so I have been walking for an hour a day, for over 6 weeks, just in the hope it will be okay all day walking.