I'm stilling trying to think them through and have been for some time but here are a few.
  1. Its not ready for world wide adoption as money. We will have to have L2s for it to truly be used as a replacement in our day to day lives. I'm not sure Lightning is the solution. It works but I'm not sure if it scales to world wide adoption. I believe bitcoin will get there but it isn't yet and for many people this is a big flaw.
  2. Miner centralization is a big threat.
  3. Irrelevance. It is possible that people just lose interest in bitcoin if the fiat system slugs along long enough. I do have concern that development and focus on it will wane over time and it will ossify.
I can't think of all of my concerns right now but those are a few. That said, I do not think they are likely to kill bitcoin.
1, with you on that. 2, hearing differing opinions about this from the community. 3, might be, although I think that we have somewhat "made it" with the ETF-approvals- at least as an investment-asset.
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