I dont think that price of 4000 dollars will ever be reached maybe $2000 sounds more probable
well there will be way more halvings in the future what will allow the price to go even more up so i believe that not only 2 thousand dollars will be achievable but also 4 thousand easily
in my opinion bitcoin will surely reach this price in the near future thus allowing us to make some money maybe not right after the halving but by the end of this year it will be possible