MobileGO is long overdue for listing. Bittrex updated their infrastructure to support ERC23 tokens. It seems they haven't implemented MGO due to regulation issues. It's unsure whether or not they will be adding many coins in the near future.
It was not caused by the regulation issue, but bittrex will never trying to upgrade their service and the erc23 will never become compatible to the bittrex, Bittrex just try to add the coin that already supported in the system only. That was the main reason about mobile go got delisted from there. As you told that Mobilego Delisted from bittrex exchange. i saw that time many troubling incident happening. Also I was face the same trouble. so i think they will not listed in bittrex.