Mt.Gox has been the dominant Bitcoin exchange pretty much since the beginning. In its brief history, it has suffered several bad setbacks, with the one last spring an incident I am intimately familiar with. There were plenty of reasons to give them a pass in the past, and many of us did. It was early. It was a complete and total Wild West and all of us interested were learning this thing together. There were bound to be some major growing pains. Gox made some changes, came back up and a great deal was forgiven. Not this time.
Bitcoin is no longer in Phase 1 of its evolutionary cycle. I believe Phase 2 for Bitcoin began in earnest back in November 2013, when the Senate Committee on Homeland Security and Governmental Affairs held its first hearings on the topic. Those hearings made it clear that, at least for the moment, no significant roadblocks would be put in place to prevent people from transacting with one another using the crypto-currency. Phase 2 also saw the largest Bitcoin investment to-date, a $25 million infusion led by Silicon Valley VC firm Andreessen Horowitz, as well as acceptance by major U.S. retailers, with Overstock being the most significant. Bitcoin is becoming serious, and serious means serious accountability.