If you lose Turkey, consequences are:
- Lose in max 20 years for good all of the Caucasus (Georgia, Azerbaidjan, etc) and the access to oil and gas which US and UK have fought for hard over 30 years (BAC pipeline, Chechnya War, Ossetia War, Ingushetia War, Dagestan War, etc, as well as chaos around Burisma Corp & Hunter Biden, all to create a second huge pipeline through Ukraine, etc)
- Loose all east-Turkic airfields and nuke missile sites, as a consequence lose > half the pressure on Iran, part of pressure on Russia
- Loose the Black Sea to Russia almost in full, even without losing Odessa in this war.
- Loose for good the ring of all originally Gokturkic nations around Russia (Kazakhstan, Turkmenistan, Tadjikistan, Ouzbekistan, etc).
- Lose for 100 years Syria, Lebanon and Iraq
- Only Israel will be left to protect the Suez Canal, as Egypt is being lost to Russia (again) and China as we speak. Transforming Israel it into a greater Massada fortress it already is : great plan, no worries there.
- Loose all access the newly discovered oil and gas below the Black Sea and Eastern Mediterranean: problems for Greece, North Macedonia, Albania, Italy in 20 years.
- In 30 years see Turkey restarting the Ottoman empire against Jordan, Saudi Arabia, etc. UAE is already gone (see new Sheiks declarations).
That gains China the almost totality of the new silk road. Also, this loses gains what's missing to China's Belt and Road initiative. It cementis its Eurasian economic influence for 200-300 years.
All of that in 30-50 years max loses the modern Anglo-Saxon influenced economic-cultural-political system the European Union wholesale due to economy.
Worldwide UK then US maritime empires ? Who'll care. At best North+South American influence for the Anglos.