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Great post. The only downside I can see with mnemonics is the fact that when your brain is gone your children has little or no chance to inherit your crypto or whatever is protected. Not even a smart contract can unlock this. Or please tell me how that would work?

This is true. You can encrypt instructions for your kids in much the same way and include them in your will :)

but in order for your kids to follow instructions that give them access to your encrypted information you need to store that in some readable format. that makes mnemonics obsolete doesn't it?

you could teach that piece of information to you kids and divide the instructions between your kids. Only all of them could make up the complete piece.