The preface for "Thou art Mindful of him" (and Bicentennial man), Asimov makes it clear that just a handful of years after the death of Susan Calvin, the time of 'US Robots and Mechanical Men' is coming to an end;
"Each of these two stories is post-Susan Calvin. They are the most
recent long stories I have written about robots and in each one I try
to take the long view and see what the ultimate end of robotics might
be. And I come full circle-for though I adhere strictly to the Three
Laws, the first story, "...That Thou Art Mindful of Him," is clearly a
Robot-as-Menace story, while the second, "The Bicentennial Man," is
even more clearly a Robot-as-Pathos story.
At the end of the story, we see that US Robotics is no longer in the business of making multi-function humanoid robots. Their primary concern is the manufacture of single-function robots shaped like animals.
Additionally they're happy for their company to become an arm of the 'Department of Global Conservation'. It's quite easy to imagine that within a few years they would cease to function as a commercial entity.
(edited for clarity and brevity)
"Although we do not anticipate the
need, there is nothing inconceivable in the possibility of robo-bees
designed to fertilize specific plants, or robo-earthworms designed to
mix the soil. Whatever you wish-"
Eisenmuth said, with an edge of hostility, "You offer us this, do you,
in exchange for permission to continue with your program of robots-I
mean ordinary, man-shaped ones?"
"No!" Harriman gestured violently. "That is over. It has served its
purpose. It has taught us enough about positronic brains to make it
possible for us to cram enough pathways into a tiny brain to make a
robo-bird. We can turn to such things now and be prosperous enough. U.
S. Robots will supply the necessary knowledge and skill and we will
work in complete cooperation with the Department of Global
Conservation. We will prosper. You will prosper. Mankind will