ranking of cryptocurrencies becomes outdated in my oppinion, its quite easy to create a currency which has a higher marketcap than bitcoin, but a corrupt sect arround the indexes prevents listening of those.
with the end of national banking cartels a time called "coins of style" will come, in this it will be more about a cryptocurrency and about its management and much less about a pretended selffullfilling ranking.
this could then also help prevent to get the market divided into new marketmovements. that want to free themselves from attention monopolies of established top 10 coins.
etc.
I don't know it still shows me as a total how one coin reacts to bad/good markets compared to others. I do not like the "ranking" part neither but coinmarketcap has a lot more stuff than just ranking those coins. Even in some sense the rank or order of coins being listed with coinmarketcap has no meaning as they do follow the amount of network by multiplying number of coin circulation with price of one coin whereas many corporate coins like ripple are highly manipulating with number of circulating coins, it makes it not the exact thing we need to consider for ranking or for sorting out.
For example I can open one up right now, see all red and than see just one green and check what coin that is, check why it is green on a blood red market and see something I may like. Or I can do the opposite, check a whole green market and see one red, check why its red and maybe sell if I have any.
Coinmarketcap offers so many stuff than just ranking coins, its wrong to assume ranking is a pissing contest, it is not, it is a way of showing which coins are actually working and which are not.