Why would anyone use a BTCif it's worth $1000 and expected to go up?

Just like how people with gold say they can sell/trade gold when times get tough, I hear BTC enthusiasts with similar responses. Gold is so high partially because the dollar it is pegged up against is so low. If it came down to trading gold for bread/food/water, how much do you think you'd really get for a little coin if there is no global marketplace to regulate price? If BTC are $1,000 a pop, and if you're looking to really buy something with these coins I have two questions: Why would you spend your coins if there is a mass expectation of more value in the future? and are we really going to shave off parts of a BTC to pay for this stuff?

I've been around BTC since they were in the $4-5 range. Now I  wake up and see $235. With an increased price, we'll have to keep an eye on extra decimals because now those fractions of a BTC have more "value".

If all of your BTC is on paper or the internet, how would you use them if there is no power? How would an EMP bomb, let's say as a result of a new war, affect BTCmining/trading/use? How feasible is it that this currency will claim and even maintain a strong position in the global economy, and by a strong position I don't mean a bunch of nerds having nerdgasms over a speculative marketplace...I mean where it is accepted for payments in many of the major countries and where people know what I'm talking about without having to send links and/or paragraphs explaining it.

Any response will be appreciated. Thanks