What escapes me is an answer to the question, "Why do those bugs take so damned long to fix?". I am not a newcomer to CMS frameworks (six custom CMSes in private use and two all-purpose multi-module CMSes in global use and distribution), and have myself chipped away bugs at a rate of 10-30 per day without too much headache.

If the bug issues arise from bad architecture that needs to be constantly revised (as the case seems to be as it's taking a small forever for what appear to be minor see more issues in the tickets), perhaps it'd be a wiser medium term call to try to just get the most critical of them out of the way, and then focus development efforts on a new, fresh framework that doesn't bear the weight of old and outdated code.