5000 dollar is a large amount and I do not think the bitcoin can reach this amount in a relative short time.
Most likely the bitcoin will rise to a pretty nice number this year but 5k is just too much and I can consider it right now as unrealistic.
This obviously will be very difficult to reach $5000, in fact I think it will never happen. you can see, even to reach $1k again it takes a very long time.
$1k can be achievable at the end of the year and if price goes higher at the time of halving then we can expect it will be much higher by the end of the year 2016.
The halving could double the price to $800. The general mass adoption can raise the price even further, maybe to $1000.
your talking is kinda correct in my opinion though i hope a bit bigger increases as i think the price has some good strength right now to go up like crazy if people will pump bitcoin price
i think that 5000 dollars is really doable in something like 2 years or so because bitcoin price will soon start going up, also more and more people get interested in bitcoin