I believe that this is all because of the big traders who are very active in trading. and this is the impact with prices that change fast. other with the increasingly difficult altcoin untik can crawl up, to a higher selling price. this is very troublesome altcoin traders
Active traders is one of the biggest contributors as why btc price is increasing. And ofcourse the demand is increasing that btc price becomes high. Altcoin price dump when btc price increase, but in contrary altcoin ofcourse will go up. So I think bitcoin will continues to go up.