I will say no to this because bitcoin is a very strong and potential coin. It is the first cryptocurrency and it has very good and professional dev and management team, it is a very promising coin and it has the largest community that keeps supporting it. It is safe, secure and also reliable. It is a good coin for hold on long term as it will yield reasonable profit. No matter how much the market falls, bitcoin will be first coin to show positive sign of growths as it controls the price of other coin so, ripple and ethereum cannot replace it even though they are also potential.