Actually, I think the current PHB fighter can get rid of all Daily powers right now and still be effective. Just give them an extra action point whenever they would normally get a Daily power (1, 5, 9 etc). Make the limitation on AP use to be one per round rather than one per encounter for this class.
Simple. Damage levels about on par with a regular fighter with Dailies. Fits the "easy for new players to pick up".
This for example could work.
I could see a Wizard with "metamagic abilties". He gets at-will powers and daily powers. His "encounter" powers are replaced with "metamagic ability".
Enlarge Spell:
- Use this with an at-will attack blast or burst power
- The blast or burst size is increased by 2.
Empower Spell
- Use this with an at-will power that deals damage on a hit.
- If it is a ranged or melee power, it deals +2d8 extra damage.
- If it is a close or area power, it deals +1d8 extra damage.
Extend Spell
- Use this with an at-will attack power that applies a condition that ends at the end of the targets next turn, or on the start or end of your next turn.
- The condition changes to save ends, with the condition itself as an aftereffect.
And if you can use these abilites only a few times per encounter, you effectively have removed encounter powers but not encounter resources.