This proposal from Dan Book seems reasonable to me. A version 7 feature bundle that renders signatures non-experimental; removes the indirect, multidimensional, and bareword filehandle features; enables warnings and utf8 by default? Sure. And more importantly, incrementing the major version every time a new feature is stable.
Unfortunately we’re still on Perl 5.16.3 at work, and it would be a big push to make sure our codebase is compatible with a newer version, much less adopt new features. But I’m willing to bet a reasonable release of version 7 might be just the push we need.