In 75 years computers may reach the maximum theoretical speed of computation

Sorry, no endless improvement in computational speed. Well then we just move to endless parallel computing I suppose.
Will this be the end of Moore's law? I don't think so, since this discusses the maximum speed of a computational unit, not the speed of the system.

1. This theory states that Time's structure itself will limit the maximum speed of computers:

• Computers have speed limit as unbreakable as speed of light, say physicists | Emerging Technology Trends | ZDNet.com