Yeah, but how many of them do you think can survive?  How many exchanges does the entire crypto market actually need? 

Look at the stock market and think about how huge it is.  Then take a look at how many stock brokerages there are and how many of them are successful.  There isn't room for hundreds of crypto exchanges, and there isn't a need for that many.  Ones like Binance have very good user interfaces and offer a lot of analytic tools, which is why they're popular.  Don't know about their customer service, but I'd imagine it's not bad--and that's why shitty exchanges like Yobit are on the decline.  They just don't care about their customers whatsoever.

You wait until governments start regulating the crypto exchanges, especially ones in Asia & Russia.  If and when that happens, that will likely weed out the ones that are scams or those that can't or won't conform to government regulations.  Why do you think there aren't that many US-based exchanges?  There's Coinbase, and I can't think of any others.  Circle used to be a legitimate place to buy bitcoin, but they decided it wasn't worth the hassle (or whatever their reason was).  And if regulation doesn't force some exchanges out of business, we'll probably see some buyouts and consolidation with the exchanges. 

In 10 years, there may only be a handful of crypto exchanges in existence, but whether that's true or not, I'm pretty certain a lot of the ones now in existence won't be in 10 years.  The landscape is going to look a lot different.