considering the massive losses last year i would say ->never
Losses don't matter. There are ETFs out there that were designed from the ground up to be as volatile as they could possibly make them. Losses come with the territory there.
What they won't put up with is exposing their flock to outrageously rigged markets. Though I'm sure most conventional markets are rigged they're rigged by the right people, not the rabble who infest crypto.
An ETF is a guaranteed no until these markets bear no resemblance to their current form.
The first gold ETF took seven years to create. I think we'll be in for a 10-20 year wait if it ever happens at all.