You can make a lot of profit with holding the bitcoin for a pretty long time and I think that if you would do it now you can make big bucks because its going up more and more from now on.
Yes you can make big profits with it,some peoples already did who started mining or buying bitcoins in early days and holding them.But that kind of increase i dont expect again,but it will go up than what it is now thats pretty sure,but this way of making money i will consider a bit risky.