If you're an author you should subscribe to Google Alerts, regular notices which tell you who is talking about your work (and, more importantly, whether it's happy talk).
I subscribe, and that is how I found out about a promotional book catalog quote by a well-connected English teacher which starts out, "Greg Heffley and Ellie McDoodle, move over—".
Maybe I should be annoyed.
Ellie doesn't want to move over.
She wants all the sales she can get, and she doesn't want to be edged out by snotty-nosed newcomers.
But there's plenty of room for lots of good books, and maybe strong competition keeps me on my toes.
I'd definitely rather see lots of great books in the Ellie McDoodle format than lots of copycats -- even if it means fewer sales.
Ellie McDoodle won't move over, but she's okay with sharing the limelight.
I can't speak for Greg Heffley, though.