Will all the Bitcoins ever just disappear?
Can the price drop very low to a dollar?
Will it go very, very high???
Tell us what's possible and what's not, and what you expect please.
No, once bitcoins are minted, they won't be lost unless their owners lose their control on the wallet.
Price can go low again. Chances are slim, but it is still possible that we hit one digits if in case something happens.
Again, it is possible that we reach 5 digits in the future. There are some speculations about it that it is very likely to happen. For speculating, I use tradingview to see the price predictions of other experienced users and I base my take on prices on that.