For the the reason you bring, fire and lightning wouldn't have been introduced at all, and the same reason would prevent your desired increase in earth abilities. Healing spells for the most part weren't based on water either. I think that was from cata onwards. Prio to that, shamans used nature/spiritual magic or something to heal, with the exception of Healing Stream Totem (water) and Earth Shield (Earth).
The non-wind elements weren't more represented through enh for a while either. Earth was down to Earth Shock, and struck the enemy with green lightning(?), while rockbiter did nothing elemental dmg based. Fire was down to FS, ST/MT, and FT, which was as much used as RB or FB, which is not at all. Fire totems were so weak as enh they weren't used anywhere but at patchwerk fights during raiding, in which enh even wasn't part of throughout vanilla. Flame Shock did deal less damage than ES because of SS debuff also. As for air magic: There was lightning spells (not used prior to wotlk/msw) and Lightning Shield (almost worthless w/o Static Shock). So it basically came down to shocks and wf/ss, which is to say 2x physical 1x nature source.
As Schizoide said, your points are all covered for WoD. LL will likely be awesome in WoD.I don't really enjoy the fire theme in enhancement.
Sounds like a suggestion for aoe, as I cant imagine a smashed-open ground to affect single targets. As an aoe, it wouldn't compete with LL anyway (aside from the FS spreading, which could either lead to both abilities used in tandem for aoe, OR the spreading aspect could be transferred, and instead of FS, ES is spread, though that would get rid of multi-dotting for faster LL refreshes...The one element that truly is underrepresented and that would fit Enhancement Shamans more than the other two specializations imo would be earth. I would like Lavalash some badass Melee Ability that smashes the earth open instead of some fancy small ass animated fire hit (with the Off hand).
While your idea sounds cool, I imagine it could graphically impact server performance if every enh had a earthbreaker, multiple Fire Novas, a AOE fire totem and Chain Lightning, all by themselves. OH oh oh, dont forget Lava Spew :-O.
If there is one element assotiated with ele, it would be lightning though. Also frost is even less used by them than with enh. Enh had incentives for using FB for some time, ele did not. And with FS/ES becoming more important for ele burst, FrS became increasingly less used. Even with FrS on seperated cd now, ele wont use it in pvp, because LB has no cd. Only enh will use it. So based on your "it was always like that" argument, enh would be the more sensible choice. The same goes for the element of earth and enh, where ES through fulmination is much more important for ele than for enh as a filler. Ele also has EQ, enh doesn't (though it is not worth the gcd atm).In exchange, if players really do enjoy frost, they could make Elemental an Fire/Frost Hybrid.
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It will come down to msw vs ss/ll damage. With the new msw perk and lots of haste, I could imagine msw builds actually becoming an option. The imbue set up of choice is like to remain wf/ft though. The percentual magical damage increase will be important for a msw build(though I can also see the value in wf/wf for msw proccing speed).
The irony in such a spec would be:
-lots of haste => more FS ticks => more lls (but they're weaker)
-lots of EotE procs => more SS/LL (but weaker) => more msw procs => loop
-EB is more often on cooldown/cannot be made use of as much as one would like