The Flatpak is already packaged and works well. It just needs to be maintained from a person that joins the Inkscape community.
This would allow further improvements like Portal support and making the app official on Flathub.
Update: One might have been found!
I’d say flatpak isn’t the future because it’s already here and seems to be universally accepted as the cross-distro package manager.
I do like how the Nix package manager handles dependencies, but it’s not suitable for app developers packaging their own apps because of its complexity.
If a better flatpak comes around I’d use it too, but at least for graphical apps I don’t know what it’d have to do to be better. In my opinion, flatpak is a prime example of good enough, but not perfect and I’d be surprised if there was a different tool with the same momentum in 15 years (except snap, but they seem too Ubuntu specific).
For what it is worth you can install Snap on most distros. https://snapcraft.io/docs/installing-snapd
But you can’t run your own snap repo
but you shouldnt because snap’s "strict confinement’ sandbox feature does not work without the legacy patches to Apparmor that ubuntu uses.
Snap is a cesspool for malware and shovel ware. The best apps are packaged by Canonical. Also, when people still cared about Snap, there were frequent reports of incompatibilities because it was developed with Ubuntu in mind.