3. How can bitcoin be used as a currency , when everybody just hold it as something unique on our universe? Hoping the price will go to a million? It will just be a digital asset for value store. ( and speculation of course). Unless you expect that by splitting the hard codded btc many times , will be enough for having btc in every house and the top guys being in quantrillion position
It just won't be used as it is not used now
In fact, after Bitcoin had first appeared before the public in 2009, it was used as Internet money for a few years, i.e. specifically as a currency. It cost next to nothing so nothing prevented it from being used as a means of payment, and no one had been hoarding it apart from a few kinky individuals (those who later turned into millionaires you mention in your post). The bottom line is that money should be relatively cheap to be used as money, otherwise it inevitably turns into a speculative asset