The amount of IRC users is still growing, any drop in users you're seeing is local to that network alone, not all of IRC. If you were referring to DALnet then there is a hell of a good reason why they have a low usercount.
Even if Khaled decided that IRC was 'dead' and he was gonna make something that uses DC, why would he adapt mIRC to do it? It doesn't make sense to make one program do two things which (in my mind) are so different.
