Bitcoin is like a dollar, only in the cryptocurrency world, well, it is worth an order of magnitude higher)
Bitcoin is like dollar??? Then why did Satoshi spend countless hours creating Bitcoin if it will be the same as the dollar then?? Useless opinion of yours.
Any government can print dollar or any other currency that they have anytime they want so it is inflationary while in Bitcoin you can't change the total supply of it which is 21,000,000 so it is deflationary. This statement is enough already to differentiate the 2 currencies.
Overall, as long as there are people using Bitcoin it will never fall. See the altcoins who doesn't have any people that are using. They ended up being a dead or a scam coin. It will not happen to Bitcoin since it is the most used cryptocurrency in the world and most trusted. No way it will fall.