Drewry Shipping Consultants estimate that container shipping lines collectively lost $5.2 billion in 2011. To thrive in 2012, the industry will have to tackle declining rates and a potentially chaotic round of mergers and acquisitions. Business leaders will discuss the potential scenarios and predictions for the upcoming year at UBM Global Trade's JOC Container Shipping Conference ShanghaiJune 4-5 at the Sheraton Shanghai Hongkou Hotel. Some analysts, including SeaIntel's Lars Jensen, believe that container shipping rates have bottomed out and the worst of the declines may have come and gone. Others in the industry anticipate that the largest carriers will continue to build market share and use their financial muscle to drive smaller carriers out of key markets like Asia-Europe…