those are impacts from production. once it's produced, drinking it has no impact at all.
but I would be remiss if I didn't point out that your link relies on poore-nemecek 2018, which ignores the fact that LCA studies cannot be combined. it's bad science.
I think you understand milk is produced as part of the mammalian reproductive cycle. can you describe the causal steps between demanding milk and its production?
Yeah, but they are not as irrational as you are and producing milk costs money. If there's no market, they will stop because they are not fuckin lunatics and they don't have infinite resources
farmers choose every day whether to continue production, and for fickle and irrational reasons. ceasing consumption cannot cause them to make any decision. they have free will, so only their will can be said to cause their actions.
This must be a parody account or something. I can't imagine anyone dumb enough to actually believe farmers will produce milk to rot ad infinitum without it ever being purchased. They couldn't maintain production level without consumption even if they wanted to.
you talk about it as though there are only two people, and each only needs to make one decision: the farmer whether to produce, and a milk drinker whether to buy it. there are dozens of actors and factors.
If people stopped buying milk at current levels, then it would not be produced at current levels. The dozens of actors and factors would all be a part of that decrease. The market would shrink, not dissappear necessarily.