Some questions I have:
How likely do you think it is that by the time this expansion has run its course Haste on gear will be high enough to make un-MC-hasted SFs replace D/ as the filler in metemorphosis? Do you think it's inevitable or only a hypothetical possibility? Is there anyway you could think of that would allow D/ to benefit from haste at a rate roughly equal to SF or to make SF benefit less from haste while in Meta?
I have some problems with SF even in its base form. We get SF at level 13, but then we don't get MC until level 69. What is the purpose of Soul Fire from level 13-68 without the increased haste and reduced mana cost provided by MC? Is it meant to be used to one shot trash while leveling solo? I certainly would not bother to use it in leveling dungeons where all the mobs would be dead by the time i got a 4second cast off. It seems like SF+MC as a proc is much more attactive than SF as a super slow nuke, is there ever an incentive to use SF as a nuke before that hypothetical future time when we have SOOOO Much haste that it overtakes D/ in meta? Why not redesign MC and SF by wrapping them together into a true proc.
Make it a spell that is only available to use when it procs.
SB is our filler in Caster and D/ is our filler in Meta, and Shadowflame and Wimp attacks build up to x limited # of stacks of Soul Fire which lasts up to 30 seconds. We cast Soul Fire which uses a stack of the buff, takes slightly less time to cast than SB, always 'crits' has a slightly higher spellpower coefficient and is either Fury free or costs less fury and does more damage D/ but is otherwise unavailable to us without the proc. That way we would never be tempted to ever use SF as a filler because it's not available to us to use as such.
---------- Post added 2012-06-19 at 09:53 AM ----------
Already not every class benefits from the haste of Heroism, look at cataclysm Enh Shamans, they provide the buff and yet it does absolutely nothing for them!! Poors Sods.
I don't know what conclusion i am trying to make, i am not that smart.
But I suspect that haste will neither be the king of all stats nor will it be the most useless of all stats.