Quite possible, and the hybrid approach is practiced quite widely - e.g., robot packing machines, robot sorting machines, etc. One big issue with hybrid approaches that require robots to run around warehouses is that humans are squishy and present a significant safety hazard that will also reduce efficiency. Much of a totally automated solution's appeal is the dramatic efficiency increase that comes from not having squishy humans on the playing field.

You mean have Robocop and Darth Vader stacking boxes?