I’ve seen graphs of the massive trade disparity between the US and China. If either side cut one off, there would be pressure to find replacement. It would be “cutting off the nose to spite the face.” So far the pressure to move to India has only really ramped up since the COVID pandemic. It takes a while to build factories and train workers
It won’t happen until there is a military clash between the two, which will end in respecting boundaries or WW3. China will fight to keep US industry from moving to a neighbor. If China wants to expand, they need capital.