To be frank, I doubt about the decentralization of Nu in future.
In 2009, satoshi himself control the whole BTC net(centralized) and that was only temporary and in 2014 BTC is successful without reliable sotoshi(decentralized).
Nowadays, several big NSR holders/custodians control Nu system(centralized), but shall we trust those Nu custodians in 2019? Decentralized? This is a fatal question, IMHO.
The burning mechanism may encourage evil activity in future. An evil scenario:
In 2019, an anonymous custodian is granted for 2 million NBT and play LPC role for one month, suddenly he runs off with 1million USD and 1million NBT, then he pretends to be another person and spread the rumor that Nu can NOT support pegging any more, NSR price drops, buying wall becomes thinner. He attacks the buying wall with 0.5million NBT and threaten NSR holders that he will break buying wall and ask for burning his stolen remaining 0.5mllion NBT to get NSR.
In fact, every custodian has the incentive to run off and blackmail the whole Nu system. Yes, they have lots of NSR, but they can sell NSR first and commit crime.