It’s safe to say that all five principal cast members of Always Sunny will be quite busy over the next year.
It may be over a year and a half between last season of It’s Always Sunny in Philadelphia and season 13.
Olson (Sweet Dee) will film season 2 of her new show The Mick in the second half of 2017 before getting back to Always Sunny.
It’s Always Sunny in Philadelphia remains one of TV’s funniest shows and it’s already signed on for two more seasons, so there’s little doubt that season 13 will get done in the time frame being suggested.