it really depends on what prices we will have in order to say whether or not reaching the $1000 price level is realistic. if the price in 2017 remains well below the $700 price level again, then it's quite safe to assume we won't see $1000 in that year. that's exactly why i have set my target for reaching $1000 on the year 2018.
Looking at the fundamentals, I would say $1000 is achievable next year, the segregated witness and Roskock platform will attract alot of investors and developers to the chain and will increase the value of Bitcoin, Bitcoin even seems under value at $1000 when compare to some coins with no real world use and are price quite high