Well, it’s a lot more plausible than “Ingria”, given it has a distinctive language/culture/religion. On the other hand (1) it is some way from an international border, making successful separatism less plausible (unless, of course, the border were to somehow move closer); (2) ethnically, it is over 50% Tatar, with a Russian minority of about 40%. Assumably the Russian minority would oppose separatism, with great potential for inter-ethnic violence, genocide, partition, etc. By contrast, Chechnya is over 95% ethnic Chechen.