One of such mechanism is POS/POW but for this requires its own blockchain... Or freeze a part of the tokens but this should be spelled out in whitepaper if they plan to do this
I think that burning unsold tokens is the only one way
POS/POW - This is the mechanism of consensus in own blockchain. And here we are talking about tokens in the ethereum blockchain
Therefore, the POS/ POW is not suitable for this project. Moreover, the POS is not implemented yet in the main ETH blochain
In WP team says that if they havn't sold all tokens then Acorn will make another ICO round for full sale. Not burn. But team part 16% will be frozen on 1-2 years. Good step!
The ritual of burning unsold tokens after ICO well contribute to the price of a token. When should marketing activities and product development according to its plans and roadmap. After the explosive summer of 2017, many people began to look more closely at the projects, teams, and including, the size of the share of the team and unsold tokens.
I agree with you but there is always the chance not to sell all the tokens and you need a backup plan what to do with unsold tokens