Wow great video. Not sure why this not upvoted .. anyway

1. Ico madness genuine threat but i think technology should still evolve and if people support it shud continue even if the price crash short term
2. Pow to pos . I think they will pull it off its a team not buterin alone
   3 bugs due go developer inexp can overcome over time
3. Public vs private chain this is a big one and could impact the value .. since industry could move to new and better alternative
4. Dependency on vitalik .. i hope there is a developer community who can take this forward and very hopefull it can happen