I think its better to have many exchanges for us to have many options. Competition is needed in order to have the best customer service satisfaction. These exchanges should offer the best for the market and in this way they cannot abuse for there are other exchanges to choose from. Traders will always find ways on where they can have an advantage.
It won't be interesting if many new exchanges are not too ready to offer different quality from the others, it will only be a spam exchange at the bottom level.
some of them even have KYC rules that are more complicated than the top exchange, automatically people will prefer a more familiar Exchange.
Low user volume levels will also kill new coins that enter instantly.