It's often difficult to extrapolate demographic and political developments into the future.
I agree and I find the 2038 date for a Kurdish plurality or majority extremely unlikely. But we can expect that the Kurdish population will increase significant in the next few decades (I think 1/3 of the population before 2040 quite likely). Many of the Kurds are born and even if the Kurdish birth rate reach parity with the Turkish one, the next generation of parents will siomply be much more Kurdish than last generation of parents.
Of course, but the map was shown to visuelise the growth, the existing Kurdish birthrate are 4 children per woman (based on the Kurdish provinces), while 1,5 for Turkish provinces
Yes it would, but it doesn't change that the children have been born, the question right now is how many Kurdish children who turn 18 this year compared to how many Turkish children who turn 18 this year. Even if the Kurdish birthrate falls to 1,5 children, the Turkish still have to deal with the fact that the Kurdish population will increase significant over the next 20 years and HDP or another Kurdish party (if HDP is banned) will be a more and more significant force. It will make it unlikely that Turkish secular nationalist will ever be able to regain power and may in the few years make it impossible for AKP in a few years to gain a absolut majority again.
I don't see one in near future, at least not until Erdogan is gone. If AKP are taken over by more moderate forces, we may see a AKP-HDP alliance dominate Turkey the next few decades, creating some kind of multicultural state.
It's unlikely at least on a scale where it would change this demographic shift. Germany simply have other sources of unskilled workers, who fit better in (East Europe), unskilled East Europeans are simply less "unskilled" (they speak German or English and understand the German labour market better) than rural Anatolians. What's more likely is a brain drain of skilled western Turks, if the Turkish property bubble burst or if people simply grow to tired of Erdogan. Turks/Kurds are in the position where they're too well off to take the really sh**tty jobs in Europe, too well functioning to be given asylum and too poor to just be let in.