I intend to write about this someday. Turkey will also fall. A short summary would be, falling birth rates, increasing population of Kurds, and no matter what Erdogan says, the Kurds still consider themselves Kurds first, and Turks never.
The military is also in disarray. Under Ataturk, he made sure that the Army would always remain secular and committed to democracy, and when Erdogan tried to become a gandu, the Army tried a coup in 2016, and failed royally. The Army has no fixed command, along with major divisions.
Add to this that their economy is going down, they don't have any major industry to prop them up for civil war, and Erdogan's slipping hold, primarily in the cities, you can expect a civil war, with the Turks and Kurds on one side. But the Turks will themselves be divided, among the Islamist rural Turks, the Urban Secular Turks, and a military which will become a weapon for anyone who can afford it.
The status of the Turkish currency is so bad, local Turks are buying crazy amounts of gold. A friend of mine from Turkey converted everything to gold, and has been stocking up non-perishables. There are articles being written about the falling economy, but no one is talking about the effect on the masses, and that is what is the most important.
Once Turkey falls, it has a MUCH larger population than Syria, and the refugee crisis for the Euros will be ten times worse, and will be right on their border. The large refugee influx will mark the end of the continent as we know it. Once Europe is in disarray, the Ruskies will move into the adjacent conflict-ridden areas. Turkey, the Caucasus, the ex-Warsaw Pact countries, etc. etc. Couple this with the fact that Climate Change is melting away the Siberian ice, and the Arctic's minerals are coming up, the Russians will sell their minerals and become really rich, while they will be able to expand without any worries. Russia will become as powerful, if not more powerful, than the Soviet Union sometime in the 2030-2040's. Once they are economically independent though, they would definitely go against the Chinese, due to a host of reasons, a few of them being, the Chinese claim on Russian Siberia, China-Russia economic competition, IP theft and geopolitical rivals in Central Asia. However, this isn't exactly good news for India as well, as they would become more neutral in their approach to us, and would look at us as a rival for influence in the Middle East, and economically. The relation between India and Russia then, will be similar to the Indo-US relationship under Clinton.
The main powers in the next 3 decades according to region of influence would be:
1. Iran(sole hegemon, probably with Russia and competition with India+America)-Middle East
2. India(sole hegemon, competition with China)- South Asia
3. India and China(equal powers competing)- South-East Asia(no country here has the potential to become powerful. Indonesia has the capability, but as they are an island, and water levels are rising, their economic centers, primarily located near the coast would face destruction)
4. America and China(equal powers competing, minor role for India)- Oceania+East Asia
5. Everyone(scramble for resources, possible equal division)- Africa
6. America(undisputed)-North and South America
7. Tricky to predict(probable American and Russian competition)- Europe