I am not sure that the new exchanges will be very popular. Because most of them are shit. People use mostly trusted exchanges, so newcomers need to try very hard to gain the trust of users.
If the new exchange site has already shown the real volume without try to do any manipulation and I think everyone will be easy to trust it and the reputation of the team is also matter a lot in this case.
The fact that if the new exchange site is still getting a lot of demand but there was so many scam exchange site.