The dominance decreas because of this and i think yesterday crash is the end of the dominance decreasing. Now we will see bitcoin dominance will be back at least to 50% of whole marketcap, and we can see bitcoin break its new ATH.
Hopefully this can happen in the near future, because as usual if Bitcoin has increased and is able to break the ATH that has been achieved this year, then the Altcoins will also experience an increase which will even experience a new ATH this year.