Can L2 be trustless?
Ecash seems so close to being entirely trustless but it's just not.
Can the mint be a dumb network that can hold coins but can't spend them?
Transaction fees on Bitcoin is a supply and demand based system, which directly affects the energy put into Bitcoin mining. At 21,000,000 if there is not much demand for transactions, mining will become less profitable.
Will mining ever become less profitable than attacking the network?