I have a serious problem with dropping the number of channels to 0 + Cha modifier. Why should you need a non-primary stat to use a class power? Sure, a non-primary stat may well give some additional benefit; barbarians gain from Con and wild order druids gain from Str, but they can still use those abilities without a bonus in the associated stat. Not so with channel energy.
The simplest solution is to not have channel be its own separate pool, but for use the cleric's spell points that fuel the spell powers.
If they want to make Channel Energy a very limited resource, they could follow a formula similar to that used for bonus languages: Every cleric can channel energy 1x/day, or 2x/day if they have a charisma of 14+.
