Hehe I still think that Cullen will survive definitely well a Qunari-based-story DLC for example, but will be there in small capacity as Advisor. But he could've got bad stuffs thrown on him by the Dev if ever they make a DLC about LyriuM... 
So Alistair's wrong then? Nah I don't read the comics so... It's very very disconcerting since he did say he didn't take it! Argh!!!
EDIT: Too many retcon makes my head pounding...
Perhaps this will help?
http://swooping-is-b...om/1286233.htmlDavid Gaider Interview
"TUK: The Templar abilities, are they--despite the Chantry's protestations--a form of magic?
DG: I would say that they are magic, they derive from lyrium, which is magic. The tricky thing there is that the Chantry is awfully hypocritical when it comes to magic, in that there are sorts of magic that they will use. Actually I should take that back, it's not necessarily that they're hypocritical, they don't have anything against magic itself. Magic can be useful, they know the mages are useful. It's the elements of possession and blood magic, all the forbidden magic where things get really dicey. Even if Templar magic was recognized as spellcasting, it's not innate to the Templars, if they just stopped taking lyrium eventually they would lose the ability. Although as Alistair proves, they can use the ability for a long time afterwards. I think part of that was just the requirements of gameplay, for us to have a specialization as well, so some of that story doesn't quite match up with the gameplay, and I think eventually we'd like to work the lyrium requirement back into the gameplay as well. Regardless the magic the Templars use doesn't involve mind control, it's not forbidden magic, there's nothing about it--especially since it can only against mages--there's nothing about it that would make the Chantry step in and go "Wow, that's bad." But then we're talking about a Chantry that also has phylacteries in every Circle, which is a type of blood magic, so there's definitely an element of hypocrisy there."