In my opinion it will take a lot to dethrown Bitcoin. Even if Bitcoin doesn't have the market cap it will still be the one that's talked about.
I dissagree, as you see the bitcoin is falling and soon ETH will be the number one on coinmarketcap, it mean that trands has changed.
do not see anything from one side only, because it can not be seen from one thing only. need various things to see the positive side of btc development. because at this time btc decreases does not mean we are discharging btc.