Anyone with particular knowledge can create cryptocurrency. But not anyone can produce gold because it is an natural mineral resource that has limited supply. While this is true, it should also be noted that bitcoin can't just be reproduced easily by copying and renaming. It doesn't work that way. If you will insist on doing so, you will definitely not succeed in renaming it alone. You can do another crypto coin, but it isn't guaranteed that it will be as valuable as bitcoin.
Remember, there are many crypto coins now circulating in the market, but not everyone has a value. Not everyone of it have the potential to rise up or surpass bitcoin too. Because without patronage, a crypto coin is useless.
They can create a new crypto but it will never be the same as bitcoin anymore. Just like a gold, bitcoin supply is also limited but it's already known that its supply is only 21 million. We can't just say that we will increase its supply because that can affect the value of btc.
I am sure that all of us don't want btc to become less valuable or to become less volatile because this is how we earn a profit thru it. @nurilham, I think that gold is backed by governments while for bitcoin, it's only back by its community. You are wrong @OP but bitcoin is already based on something that has a value and that is none other than fiat money or local currencies.