Yes, it is almost definitive. It only must be definitely approved on next FIA council.
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It won't be a surprise if FIA in the next few years comes up with some new class which will be mandatory for a certain championship and the story goes all over again.
but lets be honest, how much more competitive are they really?? and how much RRC cars are arround?? 1-2 Citroens? 1 Mini? a few Fiestas?? and only in the hands of an real competitive driver these cars can show the full potential...so let them be, in latest 1 year R5 will be faster anyway (...as soon as Skoda R5 arrive)