ETFs may turn out to be a non event, it's just the latest thing for bots to play with. Bakkt is an interesting one. But like all previous things that were going to 'save' us like futures, LedgerX and a ton of others, once they were rolling it was the same old nothing.
One thing to consider is retirement accounts. Retirement account investment is a decent chunk of the stock market, and an IRA can invest in ETFs. However,
derivative trading is generally prohibited, or at least outside the reach of retail investors:
Any type of derivative trade that has unlimited or undefined risk, such as naked call writing or ratio spreads, is prohibited by the IRS. However, many IRA custodians will prohibit the use of any type of derivative trading inside their accounts, except for covered call writing. This is because IRAs are designed to provide retirement security, so the use of speculative instruments such as derivatives is often disallowed. Those who wish to trade futures or options contracts inside their IRAs should look to more liberal custodians that permit the use of other types of alternative investments, such as hedge funds or oil and gas leases. But most custodians of major bank, brokerage and insurance-sponsored IRAs will not do this.
I'm pretty sure that rules out things like CME futures and LedgerX swaps.
So it might be interesting to see whether ETF shares could be rolled into conventional IRAs. Considering the tax benefits (no tax on gains until withdrawn), it's pretty tempting to invest. I'm curious how accessible they might be through mainstream custodians.