You got any data/numbers to support that? Compare with each healer and take EVERYTHING into account. Because it's really not that simple. For instance, Priests spend more mana doing the same HPS than Paladins (at least on my spreadsheet), but they also contribute DPS while Paladin contributes nothing. So it's still more equivalent than anything.
And your "trade" is worth fuck all because you can't just compare two/three abilities in a vacuum.
And I'm not just asking for a comparison to Monks, but compare to all healers including their entire toolkit.
Anyway, we need to begin talking about mechanics again. Right now, I'm not even sure what Blizzard's goal regarding mana tuning is. What is the intended baseline of mana-positive/free healing? Because I can definitely believe they want it to be more than it is now. And don't forget, with active mana regen comes a skill floor, meaning that an unskilled player (i.e. doesn't know anything) still can't be 100% always oom or else LFD/LFR will have field days worse than Cata.