I find it funny when people talk about "when will you sell your bitcoin?"
It's a mentality that marginalizes the value of Bitcoin. You sound like you just think Bitcoin is an investment. You sound like you're only in this for what you can grow your fiat wealth to.
If you're really committed to Bitcoin and the idea and the fundamental shift it presents to the world, the freedom of money (as we have freedom of ideas), then there is no "selling your Bitcoin". You are committed to the action of always holding Bitcoin...at least until you need to use it to buy something for your daily life. Maybe it's gas, maybe it's a house.
I don't think we'll see another 10x+ run in 2018. We need greater adoption among people to fuel another run like we've seen in 2017. The best thing for Bitcoin in 2018 is stabilizing its value at $10,000 or so. This demonstrates that Bitcoin is not in a bubble, that it's not a fraud, that it's not to be outlawed, as those in the press, wall street, and government are claiming right now.
If you're thinking about what's the right price to liquidate your Bitcoin for fiat you're missing the point
Sure, man you're right!
But now it's too late to buy weed for BTC and too early to buy a house

And I'm not sure that bitcoin will be so well-implemented (esp. in "third-world? countries) that we could buy realty without converting it to fiat within few next years.