I personally don't think it would ever happen, but ever if it did, I don't think it would have those catastrophical consequences everyone believes it would. I doubt ETFs would be able to absorb it all, but them and retail would over time. Most likely we'll experience a price drop due to the sudden increase in supply, but I reckon we'll recover rather quickly. Bitcoin is beyond the point where even Satoshi himself can damage it in the longterm. It's all FUD.