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Project idea: ELI5pedia. Like Wikipedia, but optimized for being accessible for lay audience. If some topics are too complex, they could be written in multiple versions, progressing from the most simple to the most detailed (but still as accessible as possible).
Of course it would be even better if Wikipedia itself was written like this, but... well, for whatever reason, it is not.
Yes. Not sure if its vision was to ultimately cover everything (like Wikipedia) or only MIRI-related topics. But yes, that is the spirit.
EDIT: After reading the entire postmortem... oh, this made me really sad! It seems like a great idea that I didn't understand/appreciate at the moment.