I think the only way to make the sandbox meaningful is to *require* it for apps that want to use the other neat features of xdg-apps, which are easier distribution (app bundles) and stable runtimes.
People would prefer to develop against a stable runtime that will work anywhere because it's less work than developing for moving targets of many distributions which change too often. The sandbox would be a "side effect" from them, and it will protect the users from misbehaving apps and some security flaws. -Elad.
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