Because bottom line, the only thing it improves is that there is no longer need to move the money around in armored cars, and that is not high impact in the bottomline of the economy
You lose the following:
1 - Ability control monetary policy
2 - Reduction in theft via cost in effort (same thing as with e-voting and rigging elections)
Because of that you have seen that blockchain stuff works on countries where 1 is badly handled. everywhere else nobody really cares except for the hype.
I think for the libertarian crowd (which seems to be a big chunk of the bitcoin enthusiasts out there as far as I can tell) the fact that a government can't easily enforce any kind of monetary policy on bitcoin is a feature, not a bug.
It's also convenient for purchasing illegal stuff instead of having to go trough stuff like western union (if you think BTC fees are huge I have a surprise for you). Surprisingly acquiring bitcoin was the hardest part of acquiring controlled substances (coinbase transaction failed twice with my credit card and had a tedious registration process requiring photo, scan of ID, etc. etc. - ended up buying from localbitcoin using bank transfer but it felt risky and the markup was considerable) - the rest was as simple as using a online shop and it shipping to home address - even got free shipping for a bigger order :)
You lose the following: 1 - Ability control monetary policy 2 - Reduction in theft via cost in effort (same thing as with e-voting and rigging elections)
Because of that you have seen that blockchain stuff works on countries where 1 is badly handled. everywhere else nobody really cares except for the hype.