Ice floes is a talent, not a baseline fire spell. Considering it is a talent, if it is mandatory, it has to be nerfed.
Said that, what about all the other mages who, for whatever reason, do not use IF?
You can't fix spec flaws with random mandatory talents of a random rows in the hope that, eventually, all mages will choose the mandatory ones (see Arcane Orb too).
Related note, Ice floes is a talent for arcane mages too. Is it mandatory? Nerf it or make it baseline for the specs which need it.
You can't claim arcane mobility is high cause IF, arcane burst is high cause SN, arcane aoe CC is high cause RoF, and so on.