This is actually one of the setbacks about the liquidity aspect. There may be project owners that will resort to pumps to make their coin look good in terms of trading volume. However, this kind of strategy is not sustainable. So in time, you will see the true nature of the coin because you can't manipulate the trading of your coin all the time. Anyway, it is just a start. If CMC will find another strong criteria to classify their coins, I think they will implement it. At least, we are seeing some developments on this site and they are not just sitting there for nothing.