I think possibly bitcoin price will touch $ 20000 until the end of 2018 and this will keep on growing from yearly, however, $ 40000 its quite big dream
It took eight years to reach the 2000$ price but in just six months, the price multiplied many times; this is not only affected by the large adoption of cryptocurrencies but also by big market players that put so much FIAT money in investing. This does not only affects prices and market but also to reveiw concepts like "dump" and "dump" as we have no reference point to compare with. Bitcoin market is getting more insane and no one can expect what would happens for the next hours neither for the next coming year.