I'm not so sure about this. Newer players are often equally if not more anxious to take on tanking roles, partially because there's an (often incorrect) perception that you must know everything in advance. Historically, when you look at queue times, tanks tend to be in scarce supply. So you would expect a shift towards making tanking more 'stress free.'
That's not really the case, with tanks retaining the largest pool of role actions. Whether it be interrupts, raid mitigation, and even just dps, there's a fairly broad suite of responsibilities laid out there, and no signs of stopping.
The reason why the thought of having to do dps creates so much consternation is because it creates a skill differential. As a tank or healer, it's easy to convince yourself that you're good when you have an insular community of players who look up to you and respect your ability to shepherd them through basic content. Hey, you can clear it. They don't know any better. You don't know any better. But everyone you know seems to think you're good at what you do. So when you come on to an online forum and suddenly discover otherwise, a certain amount of resentment is, well, expected. Down with those dps healers.
I think the reason why this is less of an issue on tanks is because doing dps has invaded our general consciousness. Anyone who might have dissented previously has thankfully already been converted by fire and sword (and if they haven't, let us know!) I'm trying to think of the last time that "should tanks do dps" was a serious conversation that we've had on the forums - I'm thinking maybe late Heavensward? Early Stormblood at the very latest? So from a developer perspective, it's relatively clear what our priorities are. There are still plenty of design problems in the process, but at least they know we want to do damage.
Here, things seem much more ambivalent. Some people seemingly just want to spread flowers and love, others want a mix of offensive and defensive capabilities. I'm not entirely sure why this still seems contentious over here. But if you can get a more unified response, I think you'll at least get closer to what you want.
I do think that more of the buffing/debuffing elements should be shifted over to healers in general, especially since they're here to stay on AST. CC would be interesting as well, if there were actually raid opportunities to use it. I'm not sure why Repose is a role action, but could you have sleepable adds in raids?