If nothing else, the kid's the host and musical guest on SNL this February 9th, and he already guest-starred in a sketch in 2010.
Justin's still guided by Internet phenomenon-master Scooter Braun, who's taken him on as a full partner in his talent management company. That means the Bieber phenomenon should have stable decision making behind it, and they've also both made bank and cross-promoted themselves as Braun signed stars like Carly Rae Jepsen and PSY.
Plus Biebzo's too famous to disappear overnight
at least, too big on social media. He was the first person to hit 2 million views on a YouTube channel, he built a better Klout score than the President and the Dalai Lama, and he's so popular on Twitter that even his mom has well over a million and a half followers just for being a well-liked mom.
So unless something major/horrifying happens, get ready for more "Bieber Fever". He's got an acoustic album coming out soon, and the 21st century's leading fangirls and fanboys won't know what to do with themselves. You'd better get some rest now.