Again, I find the use of the word "fad" to be borderline offensive. I use lard because it is a very good soaping oil. I've used palm and prefer the feeling from lard. To say that it is a fad is akin to saying that using coconut is a fad - there are alternatives, but the majority of people use it because of the oil itself rather than any particular fashion of the season. To say it is a fad is to suggest something else will take the place of lard in my recipes and as yet I don't see anything that would do that.
Now, lard may or may not wax or wane in general popularity here as different people join or leave, but that is different from a fad, as the lard lovers will still be loving lard, just no longer the majority on the boards