They have been increasing their use of robotics. Other low skill jobs have too (miso's burger flipper). There are still college kids and low skill people that need jobs. It seems the continual supply with shrinking job positions will enable them to continue doing this.
It'll be interesting to see how the union efforts play out. Historically this has been a major problem for bad employers.
If they automate the whole thing and have robot pickers, that'll be awesome too. About time. I used to work as a picker, and it's not a fun job. Especially the way Amazon runs their warehouses.