The industries to watch for growth in plastics machinery sales include medical and packaging and one to watch in general is automotive.  

Auto makers have introduced fewer new models which means that they are updating current models rather than going through complete redesigns.  This translates to a decreased need in new or different machines for their manufacturers.   One thing that will take form as they gear up for electric cars is that the reliance on touchscreen controls means fewer buttons connectors in the car.  
The injection market saw a reduction in new equipment sold in 2019 of about 500 from the previous year  (4000 to about 3500).  This is putting pressure on the new manufacturers to give discounts and have severely limited the value of machines from the early 2000s and older.