I honestly don't keep up with rabies vax except on my cat who goes outside.
Personally I would be more concerned with doing a regular vaccine every single year. I do mine once or twice and then maybe again around 5 years or so. IMO it is unhealthy to revaccinate every single year, I have seen too many cats come down with the problems that they are being vaccinated against. It doesn't even make any sense to me to vaccinate any living thing (even humans) every single year. ESPECIALLY if your cat is indoors only, it is just total overkill on the vaccines. If you are concerned, then when you go back for a yearly exam, have your vet do a titer to see how much immunuty the cat's system still has against the illnesses, then you will know if your cat needs a revaccine.
Many vets I go too tell people not to vaccinate every year, every three years is pretty average. Others just say that to get people to bring their cats in to be examined. Most people won't bring their cats in for check ups unless something is wrong.
I don't know, it is controversal but I don't understand why. Talk to your vet about it.