I agree to @zhangster
No matter what, BTC is still the primary locomotive of the crypto rail. It may get secondary after some time, but not now. It is still to early to write off the BTC.
Bittrex is going to open USD markets but this is one minor thing. When it will be available broadly and when people will be able to buy any coin they want without BTC, than we may say that BTC can pull back and give up the BOSS title.
Why BTC is not destined to die soon? Because:
And yes, one more thing:
Banning credit card purchases makes me to think, that mining is still the best way to get cryptos.