Lord Lucien
Lets all love Lain
Harry Potter is currently leading the pack in terms of box office success. At $7.7 billion it's beating second place's James Bond's $6.1 billion.
Star Wars coming in at distant 4th with $4.3 billion. Though I have a feeling the future Potter films won't be as popular as the future Star Wars ones. There's been build up and hype about a sequel trilogy for decades, but the Potter movies franchise owes its success to the success of its origin chronicle. Follow up books will be paltry in the popularity department compared to the original series. They struck gold lightning in a bottle. It won't be repeated.
If anything, the next few years will likely see Marvel take top spot. They have a slew of movies slated and they've been nothing but cash cows.