I think Bitcoins dominance will continue to go higher because it is the most adopted and trusted cryptocurrency, altcoins on the other doesn't affect bitcoin because we can see lots of useless altcoins are being created everyday which will vanished overtime. The only scenario that bitcoins dominance will fall when altseason starts, well we don't when will it be happening again.
We are hoping that the altcoins market will start a rally soon, hopefully this year but it's true that we don't know when.
I wasn't expecting BTC to rise that fast in the first half of the year, but it happen, when BTC had a great 1st half, it struggles in the 2nd half that's why we are still seeing a price sideways movement from $9K to $10K.
Our happy moments is when bitcoin will cross a new high as most likely altcoins will rally also.
That's the moment I've been waiting for and I will bet on it that it's gonna be the same patter that will happen.
Let's just continue to hold while waiting and enjoy trading BTC in short term since it's volatility is good now, down 5% now, soon it will be up 5% again.