My confidence is fed by that fact that bitcoin is already having a 10 years of experience of being the world's biggest and best cryptocurrency and it is a worthy and relevant at the same time when tons of new cryptocurrencies have been developed.
No matter how many cryptocurrencies are being made and listed on cryptoexchange market, these cryptos will always have a pairing value with bitcoin. That is already a statement that bitcoin is the foundation of cryptoworld that without bitcoin, these cryptos would never exist too.