This is the good news we need right now! I think this may indicate a return of confidence in bitcoin and one can hope for a price increase.
This is naturally good news, but it should be mentioned that this dominance is achieved by selling many altcoins, which in turn is a bad sign, because people do not believe in them, and therefore in cryptocurrencies....
I agree, overall the ecosystem needs more usecases than just payments, and even if you are a bitcoin maximalist you will agree that the blockchain technology opens many new areas of innovation outside the financial world. The decline of altcoins seems to benefit bitcoin but this is a narrow view. I dont see bitcoin and altcoins in so much competition, both offer different applications for the blockchain technology...if people loose interest in blockchain technologies it will eventually also hurt bitcoin, no matter the gains in dominance. Real world applications are going to take this to the next level.