-Two is a best-guess counterfactual of what might have happened had he survived Dallas.
I'm a big fan of alternate history but you don't see a lot of hit on film. HBO did The Fatherland
which was a good film for the small screen about what if Germany hadn't lost the war.
There are several other moments that would be interesting to see "what-ifs," for e.g. had England won the war of Independence.