WI Constantine's son Crispus survives?

How does the Empire develop after his father's death? From what I've read he was a talented politican, decent general, and was very close to his father, before the events of 326 that is. So what if Crispus survives to 337, and becomes the sole Augustus Claudius III, with his younger half brothers as Caesars? How do you think the Roman Empire might develop?
 
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