ETF approval doesn't mean anything long-term. Cryptocurrencies will stop to be a speculative asset in a couple of years.
Think of 3D printing or VR. Everybody thought they are going to change the world. They did not. Neither will crypto. It will find its single use case and help people's lives in that domain.

I would bet it's some kind of traceability utilized in supply chains and proof of ownership of virtual/physical goods. Or it might be something else. But definitely not as a financial asset that is replacing fiat. That is an utopia.