Yes there will be a US coin debasement soon. You must be logged in to see this link. . No, I will not hoard zinc because a) zinc is a really cheap metal b) there is still copper I'd rather tie up my pennies in.
“The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.” – George Bernard Shaw. Why Copper Bullion ~~~ Interview with Silver Bullion Producer Market Harmony Passive Income blog
There will be more to be made off of keeping just the coppers. Eventually finding copper will be like finding wheat and that will be the time to keep zinc.