BTC went up - alts went down, BTC went down - alts went down, this was the case before December, when cryptocurreny market pumped last time.
But according to coinmarketcap BTC dominance in crypto market is 34%, though it was more than 60-70% on September, doesn't it mean that people started paying more attention ta altcoins and so alts eventually becoming more "independent"?
I don't think it will happen this year or even next, but don't you think that some top altcoins may bypass bitcoin in the near future?
Eventually bitcoin will be overtaken. Though not in the next couple of years. Btc's pump latter part of 2017 made a lot of people interested not just in bitcoin but in crypto in general, hence alts were also noticed and their potentials. Bitcoin will still be the top cryptocoin for now but expect the alts to have their fair share of the market.