It would be better if many countries in the world could accept and recognize Bitcoin as a legitimate currency, even though it is difficult for now. But it is not impossible if bitcoin can be accepted by a majority of countries. So there is no need for a new country.

I think altcoins can do no harm to bitcoin because the value of bitcoin is very far from the altcoin even the top 2 in the market cap would have a hard time to reach the value of bitcoin. Maybe in the future there could be altcoin can replace bitcoin but definitely it would take so many years before it would happen.

No, I do not believe that. We must admit that what has allowed banks to acquire so much economic power is their ability to understand where capital is, and make the necessary efforts to keep it.

Knowing that banks will never fight against capital, what I see today is a growing interest of banks to incorporate blockchain technologies into their processes, and because of their marked interest in taking over everyone's money, it would not be strange that in the near future we will see banks willing to accept cryptocurrencies to carry out financial transactions.

http://i66.tinypic.com/10copiv.png
First of all, no one knows for sure. But here are a few reasons at play:

SUPPLY : Miners currently receive a 12.5 BTC reward for every block that they mine, but Nakamoto’s protocol also requires that the mining reward is halved every 210,000 blocks, or approximately four years. The next miner halving will take place within two years, approximately in early June 2020 depending on hashrate, bringing the rewards down to 6.25 BTC per mined block.
DEMAND: While the number of transactions are trending upwards (see Bitcoin Number of Transactions excluding Popular Addresses, it seems that there is not as much new interest in investing into bitcoin at the moment. Interest has stabilized, but may not be outstripping demand. gle Trends - Web Search interest - Worldwide, 2004 - present.
RISK: In addition to the price risk from the fluctuating exchange rate, there is currently a very heated debate about the bitcoin 'software' with competing proposals on how to scale bitcoin in order to facilitate more transactions (BitcoinXT, BIP10x). Without going too much into detail, the discussion questions some of the core principles of bitcoin. (high-level overview: Brief thoughts on the Bitcoin block size debate.
Don't worry about the price because it is normal and eveeything about changes of price will be more uswful to traders and buyers.
Source: https://www.quora.com/What-is-the-reason-for-the-falling-value-of-Bitcoin-Is-its-end-near-I-have-already-lost-some-money-by-holding-on-to-it-Please-advise

Is this FUD you ask?  Yes it is.  It is the utmost of fear which is the fear of the Lord and the uncertainties and doubts of those that are damned and have their part in the lake of fire.

If you read news like this https://www.ccn.com/mysterious-asian-whale-begins-funneling-funds-back-to-huobi/ that there is someone who has mysteriously bought a large amount of bitcoin. Then sell. All I can read is that Bitcoin has a fan of "Giant" who likes to invest and sell Bitcoin. This means Bitcoin will continue to run. What to worry about? What I do not want is if there is no Bitcoin buying and selling activity. Because that means Bitcoin no longer has any interest. That's what I should be afraid of.
This is just My Opinion Personally. Please fix it if it's wrong.