I think it's fair to assume that Toad wouldn't be given to us in any AoE form without every crowd control action also getting the same treatment. If I were hedging on any of the current ones getting that treatment, it would be Sleep & Repose or Foot Graze, due to Sleep and Bind being cut off by damage.
As for the Dissipation discussion, I think the duration which it lasts needs to be cut down in order to dissuade people's issue with losing the fairy kit. 15s would be far too short, as then a single Lustrate offsets the Embrace right now and I do think Endwalker Embrace makes a difference. With the Endwalker changes in mind, 20-21s seems reasonable, given the primary benefit of the skill is the Aetherflow stacks it generates, and regardless of how you intend to use them, lowering the fairy downtime would communicate to players in the know that they're going to lose about the same healing they are now, while also easing off the sticking point that keeps newer players from trying to use it in the first place, even if it isn't a problem in practice.