I would caution against assigning a single root cause to moose population decline. Speaking to researchers at UW they are also interested in other factors such as habitat, forage, disease, etc.Out of curiosity, I looked up Idaho moose info. In 2010, there were 814 antlered tags and 197 antlerless tags.
In 2023, there were 514 antlered tags and 3 antlerless tags.