Has anything been decided about this? Are such transactions currently banned?
It seems that we cannot really state what is and what is not spendable, since the transaction fees next week may reduce by 50% and the output will become spendable.
Is it not dangerous to start censoring transactions such as this?
Bitcoin is open source. Any peer can make any changes they want to the rules about whether or not they will relay a transaction, and there is nothing anybody else can do to stop them.
Each miner (or pool) can decide for themselves which transactions they will not confirm, and there is nothing anybody can do to stop them.