I think the biggest risk to the long-term success of Bitcoin at this point is it's own developers.

Some changes will need to be made.

But someday an unintended consequence may be accidentally placed there that destroys it all in a way that no one anticipated.

It's impossible for the future to be known. Impossible for consequences to be known.

These are young men. All men are arrogant. Young ones more so.

Similarly, well intentioned laws have hideous 2nd order effects.