As Charlie said...... we'll have to let history decide. It's not our call to make.
That decision will be made by current and future directors of major art galleries and private collectors around the globe (who are buying pieces by Banksy, not just Hirst, Perry et al).
You say that plenty of older works continue to represent 'the now', that is certainly true on some levels.
However, from a stylistic and technical viewpoint, they are rooted firmly in the past.
Sorry for engaging you in serious discussion; I'll try not to make the same mistake twice.
By the way, what is a head mental?