ET is primarily a "turn your next Succor into a Medica" button. It is fine and useful as is. We already have Indomitability for panic button AOE heal and Lustrate for panic button single target heal. This serves a different purpose and does it just fine.

I haven't used Dissipation yet, but my understanding is it is the "in case of emergency, break glass" button when all else is exhausted and you need immediate stacks for Indomitability/Lustrate or the party will wipe. Pre-Heavensward, I've been in situations where I would have used Dissipate if it were available.