Cataclysm was a too-cool-for-school spell way back when because it was broken/overpowered/whatever. Now it's "fixed/working as intended/broken/useless." Change it to something actually useful that actually allows druids a reasonable form of dps.
Posting my official opinion again: change Cataclysm to a quick nuke with some form of utility, like a small amount of spell dampening:
Runic: Shojar's Frozen Reckoning
550 Mana
0.5 second cast, 30 second cooldown
1250 cold direct damage
220 cold damage per tick for 4 ticks
3% dampening effect for 4 ticks (stacks for each druid that can cast it?)
Look. It's a DPS downgrade to Cataclysm. It allows druids to do some kind of damage in melee range or at long range, without destroying themselves/the world/everyone else's DPS and without wasting valuable heal casting time. It evens the playing field a little between stacking druids and stacking clerics in high end raids, at the expense of a good amount of mana. It can't be kept up all the time, so it could be strategically used for AE phases or what not.
Clerics got cool new spells (Zealot's Strike, etc) because "all they do is heal." Well, all druids really do is heal. Honestly, clerics have more raid utility than druids. Between Call of the Blessed, Purify, Divine Unbinding, clerics have a lot more opportunities to push buttons that aren't heals during raids. Druids cast Archaic once, and then heal the rest of the fight. On top of it, clerics actually do more damage during raids while healing. Please, give us something other than heals that we can use mana on in both group and raid situations. Cataclysm is usable in neither groups nor raids and only when kiting. No tier 12-13 druid really wants to have to kite to use their Runic 2. No tier 12-13 druid really wants a Runic 2 that they never get to use.
IF ALL ELSE FAILS, just give us Runic: Call of Tarhansar, because I would rather make it rain in every outdoor zone than have Cataclysm sitting useless in my spell book.