Well you have the right to an opinion but I do think you are wrong. The only reason bitcoin is so volatile right now, is because it is still in it's early days. Bitcoins are still far from it's limit cap, and it's slowly being bought as users get to know it, and trust the network and the community. Once it gets mass adoption, it's price will no longer float like this. As for it's value, it couldn't be more transparent than it is. Since it has a limit, it will only be regulated by supply and demand, so if people recognize it's value, then you can't really deny it. If at some point users decide that they don't want bitcoins anymore, and decide to sell them, then it's value will drop. But that is not a scam, that is just reflection of the true value people confer to BTC. If they trust it however, I don't know why they will do that, so I think it will perfectly work as a currency. People confer it value, and trade it for other goods.
If you say that right now it's not practical because it's volatile, and you pay high fees to buy just a cup of coffee with it, then I agree, but that will change with the lightning network.
As for a store of value, I really think you are wrong. Right now, I think this i the best function for bitcoin. A store of value is the purpose of an asset that can be retrieved, saved and exchanged at a later time because it holds purchasing power. Bitcoin actually shines here right now in my opinion. You need to mine it, and it cost money to do so, you have a limit cap, and planed halves. They will get more and more difficult to get, will require more work to be mined, so as it's demand increases, it's value will increase as well. This looks to me like a good store of value.
Finally bitcoin will actually get the best of both worlds, (precious metal and money), because they are limited and have value (like gold) and will be easy to exchange and trade for common goods (like money).
I totally agree with your opinion buddy. To think that bitcoin was just starting and not yet even reaching from its cap, there have been so many speculations to what might happen next or in the next few years that will come, but still nobody is really certain to what will be happening next in line. Its because it is only limited and important, many would do anything just to have a piece of those coins, or maybe this will cause a big ruckus in the future, specially those who have lots of those coin.