Full stop no. My argument has always been all healers. Not leave one behind. Therefore, your solution does not, cannot and WILL NEVER WORK. Just on that alone.
Also, people who would like "your" model have yet to say they also wouldn't like a WHM who has an extra few dps skills as long as it remains simple to use, which is what I would like to see for WHM. So, in the event that the second is true, your model also has no reason for existing.
Which is the compromise you keep saying doesn't exist by the way. I would much rather WHM rip SGE's idea of being a damage oriented healer back in Shb. But apparently it can't be so an extra 2 or three dps options (one likely being a DoT) that doesn't impact its healing output and aids in lily generation is all I'm likely to get if anything.
WHM if I had it my way would be more akin to BLM in terms of complexity. I like complex healers. I'm not asking for WHM to become BLM or SB SCH and AST as I've said repeatedly and you've consistently ignored because "you can't be wrong". I still want WHM to be approachable to newer healer players but that does not mean it HAS to stay as it is now and therefore, I'm not going to sit there and champion for it to stay that way.
I want WHM to have a few extra dps options to manage and also to make soloing as a healer (all four of them) to not be a boring PoS experience while still being an easy and approachable healer.
Your model is not an improvement. Its gatekeeping. Just not in the traditional sense. You're literally gatekeeping WHM's design to never get better, and you're gatekeeping healers who want something to aspire to on WHM. You are literally telling them "great, you've mastered WHM. You want something more, go play another healer because WHM can't get anything more to it." You just don't want to admit it or just can't see it that way.
Pick whichever is more accurate.