Many people make much of the failure of Malthusian predictions in the past. I think that observation is not compelling.
It does seem foolish to predict an exact date for the collapse; we have escaped both Utopia and Oblivion nicely so far. But just like mortality, Malthusianism only has to actually operate once.
The story of the Boy Who Cried Wolf has two lessons, recall. The first is that it is not a good idea to raise a panic at the slightest provocation.
The second is that eventually there is a wolf.