What if it will never drop to $3000? And then Bitcoin price suddenly pump up to $30,000 in December lol. 
Im just kidding anyway, but there were cases like this where people didnt buy during the dip because theyre waiting for the targeted bottom price. 
On the other hand, when Bitcoin hits $3k, I guess ETH would sit at $50 or worst and majority of the alts will have their all time low.