I agree to your statement, Not everyone is capable of earning bitcoins consistently and they will change it immediately. The countries economy will obviously crash so its better to stay in fiat and live a normal life. You can still earn more profit in bitcoins without changing the countries currency.

October 29, 2017 Bitcoin price ranges from $6,000 - $6,100 and today, bitcoin price is now $7,000. Are you surprise?

I think, if only those people who planning to invest in bitcoin manage to notice this sudden increase. I think there is a high chance that they will start investing.

I just always wonder if those billionaires still invest in btc. Do they even know btc exist?

Yes it is possible if your have a high amount of capital. You could also gain the token that you could trade in this forum. In my case this is the place where I get my token to trade by just participating in some bounty camapign. And as of now I curently gaining an a fix income through trading.

Kids can be taught about bitcoins with reference to gold as how we buy gold and store it and sell when prices are high. This should work for the trading aspect, while using bitcoins as online money can be taught much easily because kids today are very much into technology and internet. They can understand the concept of Digital money quite easily because they are still in learning stage and thus will grasp easily.

I don’t understand  why is limited supply a stability for long terms? I mean that could actually collapse the economy of bitcoin due to the fact that in the the near future supply and demand will be needed on enormous amounts. What would the reserves will do in such cases? How they will contribute to the national needs.

Venezuela's currency now worth so little shopkeepers weigh vast piles of notes instead of counting them

Inflation in Venezuela is expected to reach 720 per cent this year, with the largest bolívar bill now worth just five US cents on the black market.

Some shopkeepers have reportedly taken to weighing rather than counting the wads of cash customers hand them, and standard-size wallets have become all but useless in the socialist South American state. Instead, many people stuff huge volumes of cash into handbags, money belts, or backpacks, in scenes analysts have said are suggestive of "runaway" inflation.

In 2014, plummeting global oil prices decimated Venezuela's economy. President Nicolás Maduro responded by fixing the official exchange rate and ordering banks to print more cash, which ultimately devalued the currency further, while goods prices soared.

“When they start weighing cash, it’s a sign of runaway inflation,” he said. “But Venezuelans don’t know just how bad it is because the government refuses to publish figures.”

Oil makes up a staggering 95 per cent of Venezuela's exports, and accounts for a quarter of the country's economy, with oil-related revenues having historically supplied roughly half the government budget. This kind of over-reliance on a single export notoriously depresses all other industries in a country, in a phenomenon known by economists as "Dutch Disease".

http://www.independent.co.uk/news/world/americas/venezuelas-currency-hyper-inflation-oil-crisis-devalued-shop-keepers-weigh-notes-a7443596.html

I might get happen that cash might get extinct but for that government and people should start using e-wallets and it will take time to reache to every person. If crypto currency get legalised in all countries then yes this process will even take less time.

Sweden is contemplating to stop using cash by 2023, does this mean cash might be extinct if other countries follow suit?

https://www.weforum.org/agenda/2017/10/sweden-could-stop-using-cash-by-2023?utm_content=buffer40bef&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer