I don't think this is gonna work out in the way you guys think it will. If it's true that healers are unneeded, what does going on strike do? The point of going on strike is that you ARE needed but are being treated unfairly.
I suspect all that will happen is maybe queue times get a little longer(not very likely) or people that don't main healer will just switch to healer for the queue times.
If anything this may work in the opposite way you imagine cause there will always be newbie healers ready to take up the role. Basically bumping out the older people that remember how healing use to be, to replace them with new younger and less jaded faces.
Good luck either way i guess, hope it actually works out in your favor. Though i fully can see this falling into the history of this game as an irrelevant moment as soon as DT comes out, and everyone is focused on that.