I don't think it's related to miners but more the larger players valuing some form of elitist ranking amongst crypto currencies. If Bitcoin falls below $100 billion it will become a double digit billion coin, just like Ethereum. I think that's one of the key aspects to this.

I'm always very conservative when it comes to the mainstream media hyping up certain developments, which applies to Bakkt as well. I must however admit that it looks good on paper, but we really need to see it in action first. In the crypto space everything looks good on paper.  

Regarding ETF's, I think it's really done and over for now. The SEC keeps rejecting ETF's for the exact same reason. Currently people are hyped up about the review the SEC granted to the rejected ETF's, which is quite pathetic honestly. Every party by default has the right to ask for a review, and in 99% of the cases they'll be granted one. Reviews can take years at worst. The Winklevoss ETF review took over a year, and that while the SEC already knew it wouldn't stand a chance.