We live in a world where our online IDs are in the hands of the government and banks, and we rely on them to keep it secure. Blockchain IDs on the other hand, put you and you only in control. Therefore, you can store all your passwords and any other personal information on the blockchain, eliminating the need of passwords in everything.
that is not how blockchain or banks or government work! none of them have anything to do with "passwords and personal information"! banks hold and control your money, and governments snoops around in your personal affairs. and blockchain is just a public ledger that holds transaction history protected by cryptography. it is not supposed to hold your passwords or personal information.
In a blockchain future, we will see a world where our medical records are immediately available if we are in an accident; where online voting was possible; and where transparency was paramount and greed is disincentivized.
it is apparent that you are hyped up about something you don't understand. blockchain is not even good for those things such as medical records,... it is not efficient and there are a lot of other better ways.
I guess opinions differ on this matter. Blockchain voting systems already exist and have even been tested in some places, if I am not mistaken. What Blockchain adds to the voting system is inability of faking the votes or voting more than once. As for medical records, I found the following article interesting:
https://www.computer.org/publications/tech-news/research/blockchain-health-medical-records-cloud-security. It explores the pros and cons, eventually concluding that it probably makes more sense to store the data off-chain but the hashes on-chain.
Blockchain might not be the best solution, but in many cases it's a viable one.