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.
I have had a 1/2 oz Silver 0.25 BTC Lealana physical coin that can be loaded with bitcoin if the user sees fit, though that doesn't technically mean that it belongs to one of the minted coins by mining as bitcoin can only be acquired digitally by solving complex algorithms and whatnot. Also along the way, it wouldn't be impossible for bitcoin to be accepted in giant stores and groceries since tech stores such as NewEgg have already began accepting it and others might followed suit with the help of BitPay.