I don't want to necessarily promote false hope, but I do think there are some key silver linings to the situation.
In regards to Yoshi-P's current response to healer backlash: It really doesn't matter how he feels about it. He would need to maintain a stance that addresses their changes positively. Someone of his position couldn't say "yeah we fucked up, didn't we?" going into their next expansion. They need every response to raise EW up, not tear it down. I'm not saying that he's necessarily unhappy with the healer direct and lying about that, but what I am saying is that he was asked about healer depth multiple times by several different interviewers across the media tour. While I can't say it's a hope worth having, the fact that attention is being brought to those concerns in such a public fashion could inspire more effort trying to address these issues in the future. I don't really foresee healing going fully in the direction that I think most of us would want, but I just hope that makes our concerns more palpable for him and the design team moving forward.
Moreover, there was a particular response regarding their stance that healers aren't going to ever have more complex DPS actions in the future, but that's not necessarily set in stone. I'm reminded of Super Smash Bros. where, when Brawl was released, Sakurai specified that he could never imagine a character from Animal Crossing in the game, yet Villager was added in Super Smash Bros. Wii U/3DS. Again, I don't want to parade the idea that "he'll change his mind, just you wait!" But if these issues continue to be talked about in a more prominent light such as from FFXIV influencers, and Sage's popularity stays strong beyond EW's release and extends throughout the entire expansion, then there's a fair chance we could convince them to nudge healers a little closer to the direction we'd like.
Now, all of this is very optimistic speculation in an area that doesn't exactly inspire optimism, but I think it's worth trying to look at what more positive outcomes may stem from this because it may help us think about how we try and communicate our wants for the role moving forward. In other words, play Sage. Drop WHM and SCH if they're not enough for you. If you have friends who haven't tried Sage but like healing, convince them to level it. This won't literally happen, but imagine a hypothetical scenario where every healer player of level 70 or higher ONLY played Sage. It's a very extreme scenario, but I can't help but be curious about what the response from SE would be.