Did you or anyone you know do anything fun with Phin's (one time) million dollars worth of BTC?
Imaginary BTC isn't fungible with the real thing.
Scarcity in terms of space in blocks for transactions to be confirmed is necessary to cultivate a healthy transaction fee market.
This argument presumes the value of the transactions will justify exorbitant fees.
No it really doesn't, it just says there's a market, a set of variables and that the former will bitchslap the latter into place.
I think
That remains to be demonstrated.