Do you still store the entire blockchain in your homes?
If so, for how long do you think you will be able to keep it?
Population*Average spam per user=the size of the blockchain (roughly)
With both Population and Average Spam Per user monotonically increase over time, the end result increases quicker than each.
If each increases in a linear fashion, the end result increases quadratically.
Moore's law, which was unsustainable claimed linear improvement of technology over time.
Since it was unsustainable, you will need more hard drives and the real estate space for them, assuming linear growth of the blockchain, which means slower than reality.
Most important question for a witness:
Why did not you "hard fork" to delete zeartul, bellyrub, bellyrubbank in time, and returned their stolen property to their victims?
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I've never had the blockchain in my home but it is still sustainable to run a consensus node on a consumer grade PC (like the workstation I'm using to write it).
Non-linear growth is an issue, but your equation is wrong, we have bandwidth constraints (which should be more strict IMHO).
That's not related to the witnesses at all. If you chose to send someone your STEEM, or SBD then it's up to you. You have the right to be wrong.