There are problems with making something clearly stated as limited, "unlimited". For one it might make earlier buyers (who bought under the impression of it actually being limited) discontent. The second is that it undercuts any future "limited" objects since they'll obviously get reprinted/remade at the earlies convenient time.
Much of the limited content we see now seem to be left-overs from the earlier limited runs (magnets, ornaments and SS&DT) so it doesn't really count, but a second run of them?