How it would be when we have a physical bitcoin currency note? Do they already exist? If created, will it impact the market growth and loose it's value in the market? Any thoughts?
We can say that the physical form of bitcoin already exists. The Singapore firm Tangem issued banknotes of 0.01 and 0.05 bitcoins. Apparently, this firm issued banknotes in the amount of bitcoins that they had. How to walk such coins, while it is difficult to say. However, this case is quite interesting. It's actually the same bitcoin, only in a banknote. I think this does not affect the cost of the bitcoin. In the future, other combinations of crypto currency and ordinary money, bonds, etc. will appear.
I feel like op is talking about a much more widely used and accepted form of tender, like how there are US Dollars that are used by everyone in the United states. In particular, he's talking about how cryptocurrency can be used as the currency that spreads beyond just a single country if everyone across the world accepts it. It seems like a really far goal point as of now, but it could happen. Singapore making those banknotes is a step in the right direction, but I don't think it's easy to spend those notes right now. I highly doubt many places in Singapore would accept that as legal tender.
That's basically the concept and it is indeed possible. Although, what's the point? The reason why we would use cryptocurrency is basically because it is already a digital currency which strays away from the conventional fiat which is a physical representation of value. Cryptocurrencies tries to change the status quo from conventional physical money to a digital money which is much more secure and convenient to use.