well yeah thats how gnome shell will enhance their background apps section in the corner menu. Currently all you can do is summon the application from the background into focus. This implementation will hopefully replace the need for https://extensions.gnome.org/extension/615/appindicator-support/
I don't think so. The extension adds support for systrays in an unsafe manner, and after years of that not existing in GNOME (unsafety being a reason), why should it change after some design mockups?
What I could see happening is that now some devs start discussing a new systray API and in the end that would be implemented natively. Hopefully not hidden behind 3 clicks tho lol