Ethereum is a threat to Bitcoin's supremacy, though its different attributes mean it will probably not replace it.
Ethereum is not meant to be an electronic cash but bitcoin is.
I'm pretty sure the line has changed to Bitcoin now being a settlement layer, rather than e-cash. I wonder what it will be changed to next?

ya i agree btc are replaced by eth. but there is still a big gap in value between btc and eth. and yet btc still the main coin for investment.