My [unverified] intuition on AI properties is that the delta between current status and 'IQ60AI' is multiple orders of magnitude larger than the delta between 'IQ60AI' and 'IQ180AI'. In essence, there is not that much "mental horsepower" difference between the stereotypical Einstein and a below-average person; it doesn't require a much larger brain or completely different neuronal wiring or a million years of evolutionary tuning.

We don't know how to get to IQ60AI; but getting from IQ60AI to IQ180AI could (IMHO) be done with currently known methods in many labs around the world by the current (non IQ180) researchers rapidly (ballpark of 6 months maybe?). We know from history that a 0 IQ process can optimize from monkey-level intelligence to an Einstein by bruteforcing; So in essence, if you've got IQ70 minds that can be rapidly run and simulted, then just apply more hardware (for more time-compression) and optimization, as that gap seems to require exactly 0 significant breakthroughs to get to IQ180.