Their track record is great but is this really a valid metric to go from, considering Bitcoin is a completely new kind of asset class that has faced regulatory, publicity and government scrutiny since its inception?
I think justifying the odds of approval based on the track record is not an accurate way to do so. It's still possible that the SEC will turn around and say they are not ready yet, or come up with some reason to delay.
I'd say the odds are 65/35 in favor for imminent approval, all things considered. I think more regulation must come in first and delay due to that feels probable.
I think the general idea is that, given its size, position and connections, BlackRock would not bother filing their application if they didn't know that it'll likely get approved.
I would imagine that people at the very top of the food chain know each other, or are at least closely connected, to the point they could discuss any future moves informally, over a cup of coffee, before doing that officially.
In other words, if SEC had an unwritten rule that no BTC spot ETF will ever get approval, then giants like BlackRock would probably know about it from their unofficial channels.
And it's kind of telling that they haven't filed for BTC ETF until now, despite Bitcoin being around for 14 years. I'm sure they could spot an opportunity much earlier on, but for some reason, they didn't make a move.