Please bear in mind that I do not give any guarantee for bear encounters!
But I can say: during my trips to Alaska I have seen bears in great numbers. But because we are in nature anything can happen (especially the weather can cause some unpredicatble restrictions). It can be possible that the salmon migration is postponed for some reason. This of course affects the number of bear encounters.
You are uncertain because I cannot give any guarantee for bear encounters, safety and nice weather and you do not know what to do?
If you are uncertain I recommend that you do not go on this trip!
You should only go if you are prepared to react flexibly in unpredictable situations, if you get yourself into a great adventure and if you are able to deal with the small defeats of everyday living!
THEN YOU SHOULD GO!