Fire / Normal is a unique type, I'd be annoyed if it was replaced by anything. Nothing specifically to do with Fire / Fighting, I just don't want Fire / Normal to be removed at all.
normal is a huge hinderance to it
How so? Getting an immunity and extra STAB is well worth another weakness, as common as it may be. How many fire types do you know that can switch in on fighting attacks anyway? --- http://i.imgur.com/4u1biRF.png http://i.imgur.com/nYihXfu.png http://www.youtube.com/watch?v=0la5DBtOVNI