Even if we had any doubt until now, fear no more as it has proven itself in it's latest calamity.
Facts:
1- If BTC goes down it drags whole market in the downward direction, opposite is equally true
2- Even when it's percentage market cap vs. other cryptos goes down, it's fiat growth trend and it's true relevance as a index everything else is compared to remains strong
3- It's technical development never stops (lightning being latest one in the pipe)
4- It is the only big financial vehicle that is truly decentralized and uncontrollable by Banksters / Byzantines