1) would've other crypto's survived during that time ?.
2) Why do Bitcoin survive during crypto winter and other crypto's finds it difficult to cope ?.
1) Many coins will survive and many coins will disappear, high marketcap and included in top 10 coins doesn't make them able to survive. We have experienced many coins kicked out from top 10 ranks due to hack, low security, the CEO scam etc and that's make the investors want to commit suicide.
2) It's because Bitcoin created with a clear use case, no manipulation and no one can control it, so Bitcoin can be the most trusted cryptocurrency regardless it's bull run or bear market.