While I am unfamiliar with Victorian strata law, I am sure it would contain provisions for the class of resolution required for an owners corporation to change the use of an area of common property. It could be reasonable to informally poll owners to find out whether most owners value the provision of outdoor clothes drying and would like that reinstated after doing roof repairs or not. That could then inform what motion is put to a general meeting. The owners corporation certainly has to get on with fixing the roof. Whether the drying facilities are then reinstated or the area is put to some other purpose or nothing further is done is then a matter for the owners to decide.