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I can't agree with you more. if you have enough spare money, buy bitcoin as soon as possible when the price goes down. it's impossible for bitcoin to disappear or make a loss for the long run. decentralized finance will renew the economy of the world and people will no longer need banks. and I'm there're some people embarking on the development of decentralized exchanges 
No problem if you don't agree. Buying bitcoin as soon as possible when the price goes down is not always guarantee because sometimes, you need to wait for a while and analyze more to find if that is a good time to buy bitcoin or wait for more. We don't know what happens to bitcoin in the future so that everything can happen to bitcoin.
I agree that decentralized finance will renew the economy, but many developing countries need to prepare everything before integrating it with that thing.