I absolutely share your feeling 773k being too strong of a hopium. And I don't believe it.
That being said, going by rationality, it's possible to reach 700k within the next 5 years:
Even if the multiplier of 21x is incorrect, or Blackrock is not allocating 5%, there is still much much more capital waiting worldwide.
...
Its like they have blinders or have their heads stuck in the sand, I haven't seen any of these so called experts add in the derivative markets continuously skimming off the market cap.