The idea wouldn't work; FFB is lower DPET than Frostbolt unless it's cast on Brain Freeze, whether or not it can proc Brain Freeze. Regardless, we gave a fair amount of feedback in beta in favor of changes that discouraged FFB from replacing Frostbolt as the main nuke, because it was just blech.
Anyway, I doubt it's necessary. If Frost is lagging behind when we hit raid content, there are a number of knobs they can turn to rectify the problem.
FFB is a critical spell for Frost already on Brain Freeze procs, and it's a totally viable option for Fire if you glyph it instead of Fireball; the DPS difference between those two options is negligible. That's plenty of usefulness for the spell.
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