Is the Quantum Gravity mystery already solved by Susskind? Very recently, Leonard Susskind presented a lecture presenting his proposal of Quantum Mechanics = Gravity (equality means duality).
Quantum Origins of Gravity 
Is this really the end of Quantum Gravity problem? If not what are the open problems left to be answered? Is there any flaw in such proposal?
The more formal question would be if there is already a known physical candidate for such proposal even if such instance does not precisely resemble our universe literally, but only conceptually?
 A: No, and this can be guessed from the modest number of citations his GR = QM paper has received. It is true that Einstein's equations have a connection to quantum information and this work form which Susskind extrapolates is certainly interesting. But it doesn't make any claim of being applicable to the most basic quantum gravity observables which have always been scattering amplitudes with internal or external gravitons. Standard QFT methods can only compute these if we introduce an unknown cut-off for the scale of new physics by hand. The most widely advocated proposal for improving this in real life goes something like the following.

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*Build very impressive experiments which establish the existence of small extra dimensions.

*Perform even more impressive experiments to find constraints on their shapes.

*Classify the string landscape to the point where these constraints are enough to point you to a unique vacuum.

*Identify the QFT which is holographically dual to string theory around this background.

*Solve or find a powerful approximation to this QFT.

These steps are very much still in their infancy.
