Think about what smart contracts can do but without the risk (Ethereum/DAO hack). This thing can get huge if they do the right marketing!
To clarify, even if I think you meant it that way: NXT 2.0/Ardor, like Nxt 1.0, will not have a "turing-complete" smart contract language. Until today, to my knowledge they are not even planning to add the complete "Automated Transactions" feature (a limited smart contract toolbox) that was integratet into the two other (Nxt-inspired) Java currencies Qora and Burst.
But NXT developers have stated they will "integrate most relevant use cases" of smart contracts. The Phased Transactions feature is one of these use cases, as far as I know.
Exactly! Turing-completeness is what brings risk into a system as we've recently seen with the Ethereum/DAO debacle. Until this becomes bullet-proof (if that is even possible) the better alternative is to hard-code the most relevant use cases like Nxt/Ardor is doing.