I've compared the 2 versions of the Ethereum wiki page about the hard problems of cryptoeconomics:
and found that the version from 2015 has a section titled Random Number Generation:
The open-ended challenge is to come up with a mechanism inside of a cryptoeconomic context which provides random numbers as output with maximally relaxed security assumptions and maximal robustness and resilience to attackers - ideally, a mechanism with the same properties as proof of work but without (or with only a negligible fraction of) its cost.
It also mentions the "N-of-N commit-reveal, as exemplified in Tomlion's RANDAO protocol" and its limitations.
This section is missing in the latest revision of the document. Does it mean that random number generation has been solved?