Will never happen. Can't see it staying higher that say 300/400 for any length of time. if it did it would price the normal person out of bitcoin as a currency. It would be bad for 95% of users if it were to go that high..
The question wasn't will it happen, it's if it happened. This isn't speculation...
I would probably throw a party since I would have more than 5500 EUR, and that is a really big amount of money for me, then I would of course cash out, I wouldn't like to risk 5500 EUR when I can cash out to fiat. I would buy stuff and invest for a business, it would be a jackpot for me, I would go from about 4 EUR to 5500 EUR. A shame it won't happen/