The cages are for the Rider to get away from the bike keeping the bike off the ground to help remove your feet and legs from under the now chunk of metal that was was a bike on 2 wheels. The sliders on the cages are a great Ideal for the fact of material. Materials do different things when it comes in contact with asphalt and concrete. when it hits the ground at speed the first thing its going to do is bounce; not like a basket ball but like a motorcycle hitting the ground. If you are worried about saving the plastics you need to start making more money.
Recap - sliders and cages save riders legs ankles and feet. Possible rebuild of bike still costs as much as starting over.
Wait for it!!!!!!