I'm ok with many exchanges, I don't want a few exchanges getting the monopoly of the market, if this happens, we have no control on decentralization and price will have an impact since these few exchanges can charge a very high fee, because of lack of options, we need more exchanges and each one independent of the other exchanges, the stronger the competition, the better for the community to benefit.
I agree, it will also prevent a big manipulation of the markets and having many exchangez will force them to improve their services and platform. Having few exchangers around will make them comfortable and wont keep on improving.