Time will tell but basing off on the current situation we are seeing in terms of community support then its impossible to say or think that Bitcoin is really following an Altcoins price which is really hard to believe as Bitcoin is the main coin on where we are mainly supporting.If ETH would become POS then there might be some significant changes in terms of price and demand but doesnt mean that it would overtake out Bitcoin  because no one can beat out the kind even though some alts are much better in terms of technicalities and features but still Bitcoin would be still be on the top or peak spot.