It doesn't even come up in my mind to think about $1000 prices right now, let alone $4000!! $4000 is a target for after the year 2020 and definitely not before it.
Check the value of bitcoins everyday even last month, I think all of us will feel that Bitcoin price will reach $4000 very soon.It will happen before 2020.
Yes, bitcoin will definitely come at $4000, but not in this time, may be after 5 years, bitcoin=$4000.
But it is feeling very good but need patient and also need some time to come at this price. But not right now and it is impossible that after the halving bitcoin would be come at $4000. So far as i know after the halving, bitcoin suddenly come down, and that is a good time to buy the bitcoins.