Board Thread:Questions and Answers/@comment-30938718-20190316203611/@comment-30938718-20190317101835

Warptoad wrote: Ninjago is the longest running LEGO show, but nowhere near the longest theme. I think at this rate, will at the very least outlast Bionicle when it reaches its 10th anniversary in 2021.

It's a top selling theme, and it's an evergreen. So.. until further notice, assume it'll go on for like.. ever. Not literally, just until it stops selling. Tahat's what I said. Basic themes, like City will remain as long as LEGO remains. Ninjago may not.