If what we want is a rewrite of GNOME with COSMIC features, that's not going to happen with GNOME. We already submit patches to GTK, and GTK4 is gaining layer-shell protocol support as a result.
Screen sharing is already made easy with Pipewire. I've not seen any issues with copy/paste between applications. WiFi driver issues can only be fixed by kernel driver developers with hardware documentation for the exact model of the PCI device they're writing a driver for. The same goes for touchpad drivers, but I've not had any issues with them on our laptops. We sell systems where we can vouch for the quality of the driver support in Linux for the WiFi and touchpad.