It's something which seems crucial to me for reaching mass adoption (in addition to scalabilty of course...).
Already on this forum there is a shitload of people losing their Bitcoins by forgetting passphrases, the private keys, the dat file etc...
So I would like to know what technological solutions could be proposed for this problem.
To make a comparison, a lot of people are forgetting their credit card code (even if it's only 4 digits...) or losing the card and the centralized solution to this is the bank providing new card/code.
Which decentralized solutions to this problems could you think of?
Human stupidity/negligence will never be cured. Before you ever put money to something, you have to do research about it so you wouldn't regret it. It's written on wallets that you should write down your seed somewhere and passphrases are also important. It's pretty obvious. Now, if you didn't know all this, then you weren't reading when you created your wallet. If you forgot it, it's alright as long as you have the seed of the wallet.
A lot of people are forgetting things, but do we really have to implement something so big just so people would stop being so dumb? I don't think so. People have to learn sometimes.