Bitcoin is a very fast booming and rising currency and I have been hearing about there being a physical bitcoin I mean in the form of a metal.
Yes there is, however its for commemorative only.
https://www.amazon.com/Gold-Bitcoin-Commemorative-Round-Collectors/dp/B00J2B0KEO/ref=sr_1_2?ie=UTF8&qid=1507384791&sr=8-2&keywords=bitcoin Now if this is possible I would like to know if bitcoin would be a generally accepted means of payment in the next years to come and what are the possibilities of other currencies meeting it( I mean in demand and supply)
Don't presume or think that Bitcoin is a physical fiat that could be generated physically, you misunderstood this, Bitcoin is a virtual technology driven currency, it has been created thru the peoples network and hashes. It is already accepted means of payment to a certain merchants around the globe.