LIM is beloved by many Unity 7 users who hope to continue using Unity 7 installed from Universe. What’s more, community forks of Unity 8, such as Yunit, currently support LIM, and I would assume hope to continue supporting LIM, where possible.
For these reason, I do hope that, where possible, GNOME apps will continue to be patched to support LIM for at least as long as Unity 7 remains available in Universe, and ideally long thereafter, provided Yunit (or some other Unity 8 fork) ever gains momentum.