Yoshi stated during a previous live letter that healer dps was not included in the dps checks when Raids were being tested. Every content is 100% clearable without healer DPS. He also stated that healer DPS can be used to make up the difference if actual DPS weren't bringing enough of it. Healer DPS is a bonus to help clear content, not a requirement. In early stages of savage content I'm sure it can make a difference in a clear or not, just like tank dps can but once people get used to the content and are not undergeared for it, then healer DPS doesn't make as much of a difference.

By design healer DPS is not required, its a bonus. As long as the party lives, I don't really care if the healer does dps or not. Its a nice bonus but I won't be bothered by the dungeon taking an extra 5 min to complete.