I am of the opinion that bitcoin fever is coming shortly because bitcoin was also taken off the huge spike in the middle of 2017 and this can happen again before this year end. people are waiting for bull run and when its start people start putting money in it.
All 3 coins are top 20 list of this market but my first performance all there is Ethereum because Ethereum is number one altcoin and holding the second position in the overall market in a long time.
Ethereum never a threat to bitcoin as there is a huge difference in their price and it is winding every day. Ethereum still doesn't have that power will be a threat to it.