Bitcoin value will continue to go higher in the years to come because in every year there are new people adopting Bitcoin and crypto currency generally and that will make the demand curve higher than the supply curve which simply means price will keep on going higher as years go.
But, we are not having enough people to keep adopting what whales do dump. It means there are whales who have bought/mined more number of bitcoins when bitcoin was available for cheaper prices and they may create surplus supply in market by dumping their stash which may bring down prices even we have new people on board to adopt.
But one cannot say the level of activities of the said whale is that bad because they are out to make profit in away. One should not blame them anyway because they are the early investors who believes in Bitcoin and other top crypto currency and that was why they can influence the market.