I think poloniex wont list HMQ at all. Especially after the SEC declared that many tokens launched via an ICO could be classified as securities. Poloniex is based in the U.S. and has to deal with that. Besides, they already stopped adding new tokens after the Gnosis ICO, which is a “long time ago” in the crypto space. So they already stopped adding cryptoassets even before that statement. Even if they started expanding again, there were many other tokens with higher volume which are more profitable for them. Bittrex ofc is US based as well, but on the one hand they deal with regulations in a better way and on the other hand they seem to have a “add anything” policy.
Still, i don’t think it would be such a big thing from an investement/trading persepctive, since poloniex will lose marketshare in the crypto market if they stop expanding. So speculative money will flow from poloniex to bittrex and other exchanges in the long run and a listing on poloniex would not be that important anymore.