What I am seeing the potential problem here is the accumulation of crap tokens in your network. Since everyone can list their coin and be traded, sooner or later you will be piled up by trash tokens. What are you going to do with tokens that has not been traded maybe for 2 months or so? Do you have certain criteria on how long can a token stay in your dex without trading activity?
First of all, as we have pointed out in our WP, there is a listing fee of $300 for those project that don't hold their IEO on the platform. There's also a community evaluation procedure - a project must pass it to be listed. Your question about a possible delisting in the absence of trading volumes is a very valid one, and we are indeed planning to delist such assets. But the term we have in mind is 3 months rather than 2 - and the project team will always be able to contact the community and administration if they have a new release coming out or smth. - anything that can spur new interest.