This turns e.g. hard won fights for civil liberties and other very-nice-to-have things (parental leave, say, for countries developed enough to have it) into even more of a never-ending battle than they already are.
It seems like that would not necessarily be the case, since not all laws would be temporary. But there would certainly be a push to make controversial things a temporary law.
such laws are unlikely to be implemented as temporary measures, which op specifically talks about.