How much money do you think 3M makes from its Post-it Notes division?
And how much of that comes from the notes used for writing down passwords and stuck to the monitor?
And how much of that business will disappear as users buy into federated authentication?
If 3M were as visionary as me, they'd adapt their digital notes product to be a visual front-end to an identity selector. Users already think of the notes as a paradigm for differentiating their online identities.
p.s. I also expect monitor frames to get smaller as the need for note mounting surface area decreases. Start to offload your plastic holdings.