It would be a benefit in the market as that will give good competition among exchanges.
When there's a limited exchange, it would be easily monopolize by big exchanges, therefore more exchanges is already a need in a growing industry like crypto.
That is for the ones that has the courage to really stand and fight amidst the strong competition and the monopoly of these strong exchanges, most of the newer exchanges that I have seen end up packing up before they could even get to see the light of the day, and moreover, I have not really seen the need for new exchanges, because the ones we have in ground still serve the purpose for now, and if not for the monopoly we claim that we are trying to break.
There is really no need for more exchanges, because when it comes to all facilities needed, I think these big exchanges has really covered it and it is because of their perfect service that attracted people to stick with them which majority if us has already interpreted that they are monopolizing the exchange industry.