You serious? Are you really comparing btc with this hypothetical scZC?
Btc incubation period was at least a decade long. The amount of innovation in the bitcoin project is huge, but more to the point the reasons why such an hypothetical sidechain would die young are the same reasons why no other altcoin has already supplanted btc.
He doesn't understand that sidecoin = altcoin.
He can't comprehend why there is no more incentive for miners to merge mine or smaller miners to direct mine sidecoins than regular altcoins.
He doesn't want to admit that the market wants to protect the value of their investment and make it possible to use new features : the essence of sidechains.
Or maybe he does, but he is so disingenuous he will not admit it.