They did something similar to one of those! In Player's options- Heros of the Elemental Chaos!
The Elementalists Sorcerer was about as close as they've come to making dead simple caster. The Elementalists gain no encounter or daily
attack powers from their class, but instead rely on at-will attack powers that have additional effects activated with the elemental escalation power.
You get Elemental Bolt as an AT-Will attack, along with another at-will power determined by your chosen elemental type. You unlocked two more at wills at 9 and 19.
They you get Elemental Escalation as the magical equivalent of Power Strike, usable 1/encounter, with extra uses unlocking at 3, 7 and 13.
Then, after that? All you get is utility powers, which are a solid mix of encounter and daily powers, in addition to the ones in the PHB 2.