Humph... I guess this requires some knowledge of how the cable cars work and what is needed to make them work again. But I lack it.
I would put more attention on whether the condition is marked with a separate tag (whichever) or with a prefix. With a separate tag disused=yes / abandoned=yes, the object will still be shown on most maps; while a prefix pretty much deletes it from most maps (the info will still be present in the OSM database, but pretty much useless).