WI: Procopius's revolt is successful?

According to Wikipedia, when Valens heard that Procopius had revolted he considered abdicating or comitting suicide. In the end Valens chose neither and Procopius was defeated and executed.

What if Valens had chosen abdication or suicide? With no other rivals how successful might Procopius have been? Would he have lasted long, or would he have been inevitably been taken down by either the Goths, the Persians, Valentinian or one of his own men?
 
Well, what happened at Adrianople was a fluke. It's unlikely to be repeated. The problem is, with Valentinian The Great. I really doubt he's going to let Procopius just usurp the throne of his brother.
 
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