Assalam u Alikum Brother,
You are trying highlight past but with a some biasedness. I personally am a Fan of Ottoman Empire, such that if the empire builds up again today, I would offer myself for its service.
But the line “Arabs revolt”, Arabs are not to be blamed, not to be generalized, Rather it was a specific clan with political ambitions and plan in place and effect to Get a free Arab.
Try to ask Arab civilians about Turkey and their views, You wouldn’t find them criticizing or Bad Mouthing turks or Turkey. So please, Don’t ignite others to bring in the usual Arab vs Turk mess here.
Ummah did die with the End of Ottoman Rule. But the foundations had been laid 3 centuries back, Already started to cripple, The only stronghold was Turkish Empire which was then dissolved.
But then, No need to mourn the past, Allah has assured Muslims victory nearing the end, That is enough to get satisfied.
This is exactly what I was searching for since long, This Hadith.
Meanwhile, Let me confirm it’s authenticity.
@aliyusuf @SIPRA @Mangus Ortus Novem
Here is the theory, Come on you guys, Not give up, Try the detective approach here.
This “Muslims and Roman will team up” and the “Fight between Romans and Muslims” might be events happening throughout the course of the last few decades, such that this Hadith doesn’t specify the time period of this whole saga, Who knows that this whole event could have already been started some time ago ?
The key to answer is “Common Enemy”
) 
