I mean, the best way to fix the issue is to fix the healing end of healers so that you need to spend more time focused on it. With the amount of content that can be healed with 25% uptime, it's not surprising there is an issue.

But yes, if we assume that healing will remain a part time job for healers and that we need something to fill the void, having DPS spells do something for your healing spells isn't a bad idea.