I'm not trying to play Devils Advocate here, and I agree that is very sucky that some 2014 applications are still in limbo. Hell, I've not received DM yet and may be in the situation you're in next year.
I will say however, that at least it looks like there's movement for most now? Given how long some applications have been open for, details could change, medical needs redoing, if they did change the process then the application could have been passed onto another officer and sat behind applications they currently have in progress. I think most have entered "In Process" in the last few months?
Taking a quick look (and I mean quick so this may not be 100% the case), it looks like "In process" lasts about 1-3 months or so, and I suppose taking into account that transferring an older application/gathering the strings of it may take a little while longer than a fresh one, also considering the longer they have an application it looks the more can go wrong with the process (which is inexcusable!). These last 2 or so months have seen the number of 2014 applications shrink, with dates of "In process" matching some of the newer 2015 applications.
So while it's unfair that you guys have been waiting so long, there's a least a silver lining that whatever process is pushing 2015 applications through, that it could be helping you guys out too, just some need a little refreshing through either amount of time past, or general past incompetence (on CIC's side of things).