More on the alleged "small community."
I just googled to find rankings of software popularity. They aren't as easy to find as you might think, but three years ago Calibre was already number 18 on the list of "Most Popular Open Source Software Ever:"
If you believe the above link, Calibre was, three years ago, when eBooks were a way smaller phenomenon, already more popular than any
Linux distribution. I have to be a little skeptical because the link above failed to state a methodology for its ranking. However, of the millions of programs available for download, Calibre is easily more popular than 99.99 percent of them.
With numbers already this high, no one really knows whether those put off by the new interface would outnumber new adapters.