http://webapps.towson.edu/cbe/economics/workingpapers/2016-06.pdf

Quinoa prices rising actually had the opposite effect as farmers has higher income and a large market for their produce.

Those numbers of crop deaths are small compared to only the livestock deaths to provide meat. This ignores the fact that livestock eat significantly more monocropped grains, soy and corn than humans.

As for child labour in agriculture, a simple thermodynamic observation will tell you you'll need significantly less crops to eat crops than to eat crop fed animals, so really this is either moot or an argument *for* veganism.