What is great about doing a modern day scenario mod is that you can have lots of fun trying to figure out what happened next. Keeping it "real" is the only restriction.
For historical mods, yes you can always try different paths, different leaders, but you are still going over "history". With a mod set in a time period of "a few years from now", say 2022, your imagination can let rip.
If I was doing a 2022 mod, I'd have Trump retired on medical grounds by Christmas 2017. President Pence takes over...
Putin retires before 2018, we a new leader is in Russia. He is 65!
North Korea is too real at the moment, so I don't know what I would do with that.
It is Trump backing out of the Iran deal which starts the process of his retirement. His closest "ministers" stage a quiet coup. That's Tillerson, Mad Dog and the chief of staff guy.
Britain goes for a hard Brexit, and very quickly becomes a very small power, losing their UN security council status.
Merkel is assassinated by a person that she allowed into the country on refugee status.
Turkey becomes a strong ally of Russia, with China and Iran. I mean it leaves NATO.
Europe realises it is under a strong threat from the "Middle East". Will there be a muslim invasion of Europe?
Under Pence, will the USA continue its hegemony over the world, will it get worse? Isn't he a guy who sees things in "good vs evil" ways? Bush2 ?