Just about all the Marvel sequels have increased worldwide at the box office. This allows a steady stream of Marvel sequels and a further expansion of MCU. As Marvel fans we are very lucky. I think after Avengers and IM3 broke the bank we got a little spoiled and took all future successes for granted. Did you pessimist consider what would happen if Thor 2 bombed. Disney might've re-considered Marvel's plans for phase 3. We averted a potential disaster with Thor 2's 600+ m box office performance.