In a way I think a lower bitcoin dominance is a good thing. It allows people to own various cryptocurrencys instead of having everything centralized in bitcoin. If everyone just used bitcoin it would make bitcoin a large central target, especially for banks, governments and other controlling parties. That way if someone wanted to take down, or take over, crypto, all they would need to do is infiltrate bitcoin. If we are free to express ourselves with different cryptocurrencys we can have many different forms of wealth and payments. Thus spreading out the market and technology, keep everything open source, permissionless, ect... of course.
Idk, my two cents. I'd be okay with having more than one dominate currency, especially if we can get things like atomic swaps working well.