The devs should fix the wallet/sync issues first and i think this is the only roadblock. If you guys have noticed the trading in back cryptopia for XRB, it was very active and active trades equals profit for exchange sites.
If other exchange sites list those dead/scam coins, I don't see a reason why they won't accept XRB (in the future).
I think it's not that they don't want to list Mrai it's just the issue that arise from holding mrai in their trading board Cryptopia will always protect their interest and they saw that it's not worth holding mrai there because of the many issues that arise,if no issue and everything works well,mrai has a good chance to enter to as many exchange there is.