year of the four emperors

Nymphidius Sabinus was a Praetorian prefect who played a crucial role in the downfall of Emperor Nero by persuading the Praetorian Guard to desert him. Between Nero's death and Galba's arrival in Rome, he tried to take the throne for himself. Unfortunately for him, nobody took his claim...

What if Otho had managed to put down Vitellius' rebellion? Could he have remained emperor had he done so?

Even Tacitus was pretty pessimistic about the Roman Empire's survival during the Year of the 4 Enperors. So, what if the empire tears itself to pieces? What are the likely splits that would occur? Is this even plausible? And would anyone be able to put a Humpty Dumpty Roman empire back together?