why wouldn't a new investor buy scZC on a fiat exchange? why wouldn't a miner want to not only mine tx fees for scBTC as well as mine scZC block rewards + scZC tx fees?
don't say there is no one "using" scZC. Bitcoin's price started out at $0 when no one was "using" it. look what happened to it.
Why? Because it's essentially a new alt coin. How is the actual zerocoin doing? Any miners bothered merged mining it?
The new investor can either buy the scZC and expose himself to all the risks or buy BTC and use the scBTC zerocoin feature pegged 1:1 with the risk-free put.
Which one would you use?
Sidechains are there to create new applications/features that are not possible on the Bitcoin chain. There's no reason why you would create a sidecoin on top because it defeats the whole purpose of the 2wp.