Much as he never imagined “Diary of a Wimpy Kid’’ would become a publishing sensation, selling more than 100?million copies worldwide, Plainville author Jeff Kinney didn’t figure his series about middle schooler Greg Heffley would be turned into a musical.

But it has and the show’s next stop could very well be Broadway.

A production of “Diary of a Wimpy Kid: The Musical’’ by the highly-regarded Minneapolis-based Children’s Theater Company closed over the weekend, and the enthusiastic response from the audience and critics has led to inevitable speculation about a run on Broadway.

“I didn’t know what to expect. I didn’t know anything about the Children’s Theater Company when I sat down for the table read last fall,’’ says Kinney (inset). “But from the first bars of the first song, I could tell this was something special. I was really blown away. Broadway isn’t the be all and end all, but in the back of everyone’s mind, it’s the hope.’’

Backed by Broadway producer Kevin McCollum and Fox Stage Productions, the show’s creative team includes Kevin Del Aguila, who wrote the book for the musical, Michael Mahler and Alan Schmuckler, who handled the music and lyrics, and director and choreographer Rachel Rockwell. Kinney made occasional contributions, but says the others deserve all the credit.

“Most of the work was done by people who have talents much different than mine,’’ he says.

Although the “Wimpy Kid’’ book series is aimed at a young crowd, the musical is intended for audiences of all ages. Comparable material that made it to Broadway includes “Matilda the Musical’’ — the touring production of which opens at the Opera House this week — “School of Rock the Musical,’’ and the short-lived “Tuck Everlasting.’’

“I don’t see it as children’s theater,’’ says Kinney. “The message of the show is you never leave middle school behind, and it’s a message that speaks to everyone.’’

The author, who doesn’t consider himself terribly musical and in fact has seen just a handful of musicals, including “Annie,’’ “Brigadoon,’’ and “Les Misérables,’’ calls the experience of watching “Wimpy Kid’’ set to music “the coolest thing [he’s] ever been associated with.’’ But he’s not giving up his day job.

When we reached him Tuesday, Kinney was writing.

“I’m working on the 11th book in the series,’’ he says. “That’s what I’m doing.’’