And who erects the fences? Who wears the crown?
The same force that prevents you from spending my coins: the hardcoded rules that define the Bitcoin system, autonomously enforced by every user.
Rather than cap the blocksize, I would rather raise the minimum non-zero fee, to say 1 penny.
Either pay a penny, or don't.
Who decides what a bitcoin is worth?
Consider that 200tps would give you $172,800 a day in security under such a scheme.
What reason do you have to believe that 200 TPS is viable in a decentralized consensus system or will be in an interesting timeframe?
What happens if 200 TPS _is_ in fact viable, but at the limit of it... but the offered load at a 1ct fee is 40000 TPS? Do you expect the miner(s) to turn down an extra $34m/day in income to preserve decentralization?
Why do you believe $172k/day is adequate security? That is only $1200/block. If someone accepts a single confirm, then it would be pretty profitable (200% ev) to attempt a reorg attack against them if you have access to--say-- 10% of the hashpower and can make a vulnerable $12k transaction with them.