Even if packages weren't broken, the fact that they make it easy to use the AUR is problematic because the AUR expects the latest packages from the Arch Repos. Often, AUR packages will break on Manjaro for that reason.
Are you using the AUR? The package will probably just get orphaned or the upstream will change to a duplicate repo. I don't see Yuzu or Citra going anywhere considering they are open source.
TVs are also a product that seems to last, at least on my experience.