"sustainability, efficiency, incentives, privacy, and decentralization"
Sustainability refers to many things, first and foremost the need to reduce the unsustainable energy requirements of the Bitcoin blockchain.
Efficiency: A new modern cryptocurrency should achieve the throughput of major credit card networks (ten of thousands of transactions per second).
Privacy: That's simple. Transactions should be totally private ans untraceable, as in the wildest dreams of cypherpunks and crypto anarchists.
Decentralization and incentives: The new cryptocurrency should be designed from the ground up to enable and optimize the operations of a real space-oriented Decentralized Autonomous Organization (DAO), with incentives designed to attract all space enthusiasts, including the best and brightest doers.