I'm thinking and thinking a lot about following thinks, maby you will call me paranoid but i thinking still about it
1) whats happen if tomorrow all BTC is 1$ worth?
2) what if all countries govoment do crypto currency eg. bitcoins illegal?
3) I can put my bitcoins in a physical product where I can graders me much better against the volatility that is bitcoin exchange rate?
4) The very best way to protect against a hacker attack or against a steal all your money from your wallet ?, are there any ways to choose a safe solution here?
I am a little worried about it and naturally want to protect myself as best as possible.
The biggest problem you have is only yourself. I would add another question toy your four made at your main post. If in this moment happen an earthquake and everything die (including me firstly) and on the earth will remain live only you what you will do? Add even this question to your questions and think and think to find a solution.
Meanwhile I am giving my answer to your 4 "big" and "important" questions (which probably leave you without sleeping every night):
1. I can assure you (giving all the amount in us dollar with the today price of bitcoin if happen otherwise) that tomorrow the price of bitcoin will be not for sure 1 us dollar. It will not be even after tomorrow. We will discuss about after two days because exist a risk that this day the price of bitcoin can go at the amount given by you. In order that you be safe sell tomorrow of after tomorrow all your bitcoins with half of the today price (to be sold immediately) and then buy again bitcoin after two days when the price may go 1 us dollar. And to be sure that everything goes without any problem I am ready to buy your bitcoin (all those) with half of the today price.
2. If will happen the supposition made by you at the second point be sure that when all the countries will have concluded such action you would be already in that place when are most of the humanity (whatever can be your actual age) and, according to me, in that place have no importance what happen with bitcoin.
3. In this point I can call you stupid you don't do this. If you would tell me that you don't know which is this product I can tell you that how do you know that exist (te mention it in your third question).
4. Very simply a 100% secure. Use Coinbase as your wallet. Offer all the possible warranties and securities which can be imagined by the human brain.
Be safe my friend and begin to sleep because will arrive ad one point in which will ask to the others: What is my name?