As @TMDesigns notes, there will always be agencies with vested interests in rebuilding sites in wordpress. Often SEO ‘specialists’ with the bogus claim they need wordpress to achieve SEO results (and can hence take more of your money)
Portland Labs are using Concrete CMS for some big US Gov projects, so we can be sure Concrete CMS is here to stay. There are plenty of other major sites using Concrete CMS.
The update schedule for the core is now monthly, so we don’t need to wait for minor pull requests (though I don’t recommend updating your site core every month).
The documentation system has recently been reworked to provide version specific branches.
A rebuild of the addon and theme marketplace is currently being tested.
because I really love it. And so do my clients who use it.
Stay with that sentiment. That is why Concrete CMS has a future.