Trading ETFs would reduce costs but move away from bitcoin's function as decentralized money. Certainly individual traders have more agility but they would have the limitations of the network against. How will it be solved? It only occurs to me that the bitcoin L2s play their role, but beware, lighting is becoming centralized because it is not easy to have a node and operate the channels. Thank you for your comment.
RE: Traders vs ETFs, the silent war