Therés a lot differences between 2 and 20 blockchain, really... it just comes down to market shares, it's not healthy for the market to be concentrated at the same place, thàts why I'm concerned.. ^^
Plus, it would be way harder to invest in such a plagued market.
To me, there's a good diversification of the market theses days, I am just hoping for it to keep going like that. I find it convenient to have different block chains, depending on which are your hopes and expectations, and uses, of course.
Plus, it could lead to specialization, like, some block chains will be way more efficient at handling certain types of trafic, and that would settle the market shares