THESIS: I believe this is a concerning matter because something we can possibly create can destroy as a economy it will be a great mistake that us would put among ourselves, the people as well as the other species that live on our lovely planet, Earth.
REASON 1: Us the population species crowding the Earth can make something like a machine to completely dominate the world and leave us instinct. I think this will cause some controversy to the way humans have turned, adapted, and amended the world into. We run the earth differently from before and it's been well improved to our opinion, contrasted to many eons ago.
REASON 2: Another reason I believe this may transfigure our planet and crash it to it's doom is due to the common lifestyles we have created and now what many of the things on our planet commonly depend on. Animals who are taken under human care will die and most likely go instinct due to this exertion takes place. We've shifted these creatures into a more easier lifestyle making them more feral, we feed them, wash them, provide habitats, etc. This will greatly affect the food chain in my perspective.
CONCLUSION: These are the 2 main basis on why I think machines ending our existence on earth could be a possible concern, because of how we amended our earth, and effect on the food chain and adapted lifestyle of animals.