Yes, moving to a rabies-free country is the best option! You're so right about those other risks and I know you are very cautious about your cats as well as public health (it sounds like the others commenting on this thread are, too).There are other risks that need to be calculated, more likely in my case than your example: like when a cat bites his human, or what’s worse, some other human - as unlikely as it is, it still can happen and the consequences for unvaccinated cat can be horrible. I’m aware of that. In my case the easiest and most likely scenario is moving to the rabies free country or the one when rabies shot are not legally required and any risk is close to zero (like in most European countries). That’s what I meant when I said about skipping this vaccine.
But... I've seen enough posts on the site about not getting rabies shots (plus remember being lax about lateness in the past, in part because I knew immunity can last longer than the vaccine's labeled use so just slacked) that whenever the topic comes up, I always mention the worst-case stuff. Our two situations -- the first of which even involved getting rabies shots for us since there had been cat scratches and even a small nip/bite when the cat had a seizure -- really brought out the seriousness of it all, even for indoor cats.