who will mine these decentralized SC's? seriously. Bitcoin miners are only incentivized to mine for BTC as money. we've already agreed they will only mine those utility chains that enhance that function of money, not speculative SC's who take advantage of the SPV proof to advertise themselves as "decentralized or more secure".
Exactly right, which is why most "speculative" SC's will be irrelevant unless they can demonstrate a sound business model that is not speculative just for the sake of it.