By Amy Wilkinson
Updated June 25, 2016 at 11:49 PM EDT

VidCon, the annual gathering of digital creators in Anaheim, California, might attract 25,000 attendees each year and boast plans for expansion in Europe and Australia, but back in 2010, the convention amounted to little more than 1,200 people in a hotel basement. And back then, The Fault in Our Stars author John Green wasn’t so sure about brother Hank’s fledgling meet-up.

“If I could tell 2010 me that VidCon would be what it is today, I think 2010 me wouldn’t have probably begged Hank to stop doing VidCon, which is what 2010 me actually did,” Green told EW backstage this week at VidCon.

Any previous misgivings aside, Green is clearly pleased to be a part of this continuously growing community. “I have no idea what the future of VidCon looks like,” he said. “My brother has done an amazing job, and I feel lucky to have been on this ride with him, and I’m so proud of him and the people who work so hard on this. But 10 years from now, whether there’s 150,000 people at VidCon or 1,500 people at VidCon, I’m excited to be here.”

As for his own future, Green is working on curriculum materials for the educational CrashCourse YouTube channel he created with Hank, as well as writing a new book.

“But I’ve been writing a new book for several years, so who knows how long that’s going to take,” he said.

Check out more of our interview with Green above.

VidCon also marks the debut of Time Inc.’s new video platform, INSTANT, covering the lives and projects of all of your favorite digital artists. Check it out!