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I don't like those risks. Those risks heavily overlay with risks associated simply with "Bitcoin price explodes" scenario and not are ETF scenario specific.
Transaction volumes ultimately generate fees for bitcoin, supporting hashpower and the security of the chain. If everyone instead just parked their bitcoin in an ETF, Bitcoin itself could be threatened.
The same can be said for ARK or LN protocols. From time-to-time ETF managers must touch the base layer, but each their tx would represents many (thousands?) users actions. So it fits the "future block rewards high because of L2/L3" narrative.