the demand only exists in the minds of devs who gotta dev and get paid handsomely to do it. Blockstream offers the opportunity to cash in big time thru SPVproofs if they can pull it off.
Blockstream will cash in big whether or not SPVproofs is implemented because most of their clients will be content using federated servers model. SPVproofs hardly incapacitate their business model as I have shown.
miners don't care now about supposedly functional federated server SC's with 2wp. they do have to worry, otoh, about SPVproof enabled siphoning of the very BTC tx fees that they rely on to survive in the long run if SC's get added to the source code that systematizes/institutionalizes and endorses the entire concept.
Absolutely not true once again. Federated server models will compete with SPVproof chains. If SPVproof chains do not exist then the BTC tx fees will be siphoned to federated servers and will be out of the reach of miners.
If SPVproof gets added to the source code then we can avoid this situation and allow miners to maintain their incentive by mining any chain that gets universally adopted and supported by the community.