Well? How could we see the maximum extent of Turkish Language, and maximum extent of some identifiable "Turkish culture", by 2000 AD? Ideally, such a world shoul be no more then 100 years behind or ahead of OTL's developmental level...
Bear in mind that an Ottoman wank may not neccesarily work. Further conquests in the European, Persian or Arab lands would further dilute The Ottomans, who after all, were not paticularly "Turkish", apart from the last few years of their state.