I agree, it's decentralized and very hard to manipulate but whales still do it and when they do prices skyrocket or dip. Either case is a chance to make money, either by accumulating cheap BTC or by selling when reaches it's peak. Whatever the case is, BTC will exist for a long time or maybe even forever.
The price may increase soon because many people will invest here in order to get Bitcoins in very large quantity and to make a collection on using low amount so this is the way they are following and you need to follow the same because everyday the market is not available like today’s market.