Is that necessarily a good thing? I mean what do we really know about him, what his policies will be, what he stands for on national issues and so on? What is his concept of the national interest? Or would he just try to prove his liberal credentials by bowing to every western demand. How will he deal with the PKK, our security interests in Syria, or our sovereignty in the Aegean and east med, the economy and all the bigger issues which the AKP has messed up.
He may be good at exposing the corruption of the AKP in Istanbul, but maybe that's where he should stay. If he can prove during his tenure as mayor that he can handle the job responsibly, effectively without being partisan then okay otherwise we don't need another councillor trained in petty party politics leading the country.
I would much rather a proven non politician who can put the country first before a party lead the country, like Hulusi Akar than another personality cult.
Just because he can potentially smash the AKP corruption and exploitation of Istanbul doesn't make him a future leader of the country. Let him prove himself first, only time will tell if he's up to it for a bigger job.