Yea, hard to balance, but to me as long as I do attacks to do heals, don't matter how high or low dps is and as long as resulting heal is good, then nothing to complain. After all, healer is not to top dps charts but to heal. Problem might come with balancing normal style healers with dps healers, since if normal healers don't dps to heal and heal same amount as dps, then a need for normal healer would be gone, then if dps healer heals less, then the only roles it would be able to perform is to offheal in ops and perhaps maximum to be able to solo heroic difficulty dungs.
So some solution surely is available, just need to find it.