I think this is an interesting idea but it is not so easy to implement. One thing I still dont understand is how the value of one token increases with time and second problem could be to find partnerships with taxi services and find the best technical requirements for payment.
They are not necessarily dependent on partnerships with taxi services, why would they? Anyone with a license will probably be able to sign up on their platform and start benefiting from the tools TAXI token is going to provide. That alone creates a lot of advantages and then even taxi services might decide to sign up to not miss out on the opportunity.