Being able to disable markdown within comments would be a start - although in my view the original post content itself still needs the ability to add H1, H2, bold etc.
I was originally hopeful, but after considerable research I very much doubt that there is much appetite for this to be developed by third party developers, not least because of the ongoing maintenance issues associated with third party plugins. And if maintenance isn’t proactive, imagine building up your community and then upgrading to an essential release only to find most of your existing posts are ill formatted.