$1000 seems a very realistic possibility, but I think that price will arrive gradually, and it could take one year or two to achieve such level, in my opinion.
My suggestion is that if halving brings great profits say $800 and more, achieving $1000 on January is not a tedious one..
Yeah everything depends on the price at halving, as if price goes higher at the time of halving the we can expect that bitcoin can hit $1k mark by the end of the year.
It is very possible for the price to be $1000 by the end of the year. It also depends on the mass adoption of the bitcoin.
I think the price could be higher than teh $1000 estimated. The SegWit could even double the price in the next 6 weeks.