Exactly because bitcoin price depends on so many foreseen and unforeseen factors so for someone to say he or she know exactly where the bitcoin price will be is just a mere speculation. I think the best approach is to remain flexible in the market.
We know about the trend in the long run - and we don't need more than that, in my opinion.
Of course, we can analyze and try to get the dips and corrections and how the price would go sooner or later, but in the end, the value of BTC would only go upward in the decades to come.