Thanks for your valuable opinions. It is so logical indeed.
Evacuation would depend on the evaluation of the risk of any situation threatening to worsen. And that depends too, like many things in aviation, on the individual judgement. (and not on precise criterion)
My thinking of other similar situations where evacuation were not necessary + the lack of sleep, got me wondering on what
precise criterion does an evacuation depends on. And IF 2 differents captains COULD have differents opinions on whether an evacuation is required or not.
Time for me to go sleep