I just don't understand the fixation on "2.0" though. A major version change means a large part of the underlying platform has been changed. It is not some number thrown around for marketing purposes, or for simply adding more features. That has been the core of software versioning since the early days of software development. "Point" upgrades are for adding features. xF could go to 1.25.0 or 1.50.0 for all I care!
And in my opinion, xF will probably do well continuing to refine old features and add new ones, since the underlying core isn't broken or outdated at all. When it does become outdated or too restricting, to when new features can't easily be added or the developers cannot move forward with new ideas, that is when a new major version needs to happen. I am not a developer, but given how well the new features in 1.2 and 1.3 have fit in with the others, it's obvious the core of XF is well built with plenty of room to expand.