I agree with that, but what of this scripture?
King James Version (KJV)
7And the cow and the bear shall feed; their young ones shall lie down together: and the lion shall eat straw like the ox.
8And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the cockatrice' den.
9They shall not hurt nor destroy in all my holy mountain: for the earth shall be full of the knowledge of the LORD, as the waters cover the sea.
It seems that in this scripture God is expressing displeasure of animals that hunt.
For one, I don't think one can rightly assume that this was the condition of the original creation. God isn't going to restore the earth to the garden of Eden conditions - the Garden was just a shadow of the glory of the new creation.
There may not be a need for food in the new creation - that could answer why animals won't be eating other animals.
This language could also be symbolic of the peace and security in the new creation. Wildlife was often symbolically used of danger. The punishments described by God's prophets often included imagery of wild animals attacking. That's what happened when Adam surrendered his authority.
It's interesting that God says the reason wildlife will get along is that the "whole earth will be full of the knowledge of the Lord." Do we think this means that animals will have some revelation of who God is and not want to eat other animals anymore? There seems to be generous use of symbolic language here. Will there really be nursing children in the new creation? There won't be any marriage. I really don't think there will be any procreation in the new creation. Even if there were children in the new creation (which I very much doubt), why would they be putting their hands in snake holes?