The entire thing with bitcoin is to create scarcity. Scarcity is the thing they believe will drive higher prices long term.
Full disclosure, I own bitcoin.
With that said, I am fully aware there is zero underlying assets supporting bitcoin. It's all a belief in something.
One thing about a currency is it must be transferable in many different denominations. For example, $1,10, 100 etc. Currency must easy to scale to support buying anything from $1.00 to $1,000 conveniently. Will bitcoin have this, Nope. WIll someone really use bitcoin as the preferred money to buy my bike for sale for .6258 bitcoin? Nope. It's not a easily transferable currency, unless both parties have the technical ability to make it work, which is new for this world, a technical component to buy and sell. Also, the value changes so fast that one must look up what the value is constanly to figure out what they have. For these resons, it will never be a currency.
It's a speculative investment that has no intrinsic value. Never forget this.
I am hoping when I want to sell my bitcoins, I can. Just like with gold and silver, it's easy to buy, but trying to off load it at scale is next to impossible.