Both of the state’s federally recognized tribes have pursued tribal gambling facilities, and the Massachusetts Gaming Commission is sitting on another commercial casino resort license that’s earmarked for the southeastern part of the state. Expansion remains on the table in Massachusetts. The crowded market and lower-than-expected revenues - and the taxes they generate - may require a resetting of expectations for the casino industry and could serve as a red light warning against further expansion in the Northeast, specialists said. The casino’s owner, Wynn Resorts - now going through a license review following sexual misconduct allegations against its founder - wants to open the resort in late June. Competition in the Northeast market will tighten again with the addition of Encore Boston Harbor, a $2.6 billion resort in Everett, with a gambling floor big enough to park jumbo jets.