While the Amiga would fill in the lower price range, does it really make
sense to sell two machines from the same company, that are totally
incompatible? Yes Apple did it during the coexistance of the ][ amd the
Mac, and C= did it during the days of C64/Amiga and to a limited extend
during the Amiga/Colt era.
However, the junior machine becomes classed as a "not a serious computer",
which is something the Amiga faced for a long time. At the same time, you
are trying to market an entyr level computer with little support outside
of the Graphics/Video workstation areas.
If Dell had decided to market it as an entry level computer, you could
kiss off the 4000's and anything beyond that, as their prices would
approach those of the PCs that Dell was selling to its main customers.