Yes I agree. We wanted first to test the existing plugin to see if we could make Joomla 2.5 (our current version - already working on upgrade to joomla 3) and XF work together but it seems this is a loss of time.
As JFusion does not take in charge any development for Xenforo and as the great Coop seems to have gone away, I am currently looking for a developper that could do this job.
If anyone is interested to share the cost, we could fund this development together ?