WI: Olaf II Haakonson does not die

What would happen to the future of Scandinavia if Olaf II didn't die so suddenly, thus managing to form the Kalmar Union and dominate it with his great skills himself?
 
we don't really have any definitive clue how good a king he would be, so its a rather blank canvas ... that said ... not getting Eric of Pomerania anywhere close to the throne might by a good thing for the union in itself
 
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