I think you're confusing ETH and ETC roles in this thing. ETC stands for Ethereum Classic, as in the original. The soaring, new version today is ETH...no?
ETC has hardly appreciated in the past year...It is ETH that has taken off. So if BCC is to appreciate like ETC, it will have been a non-event!
Actually, both ETH and ETC "soared" since the fork, and by comparable amounts. As I recall, ETC started out at something like $0.70 when ETH was around $10. Currently we have ETC at $14 and ETH at $200, so that would be a factor of 20 for both.
ETC has always been priced an order of magnitude lower than ETH, but their relative price appreciation has been comparable. ETC rode the same rocket upwards.
Thus, I'm still wondering about BTC and BCC in this context. What will happen to potentially valuable coins that Coinbase won't give to users, yet won't grab for itself, either?