The other machine we had in the worked was Joe Augenbraun's Amiga 1000+. This was probably the machine that would have really boosted the Amiga's profile. It sat squarely between the A500/A1200 and the A3000/A4000... detached keyboard, two Zorro slots, a new CPU socket, etc. The intent was to ship at around $800 in 1992, with AA chips and a 25MHz CPU (probably an EC020 or EC030, but still).
Sounds like the A1400 machine C= UK was planning to fill the A1200/A4000 gap. This would have sold like hotcakes in 1992 for £600ish in the EU as PCs were so cumbersome (Win 3.1+DOS) and expensive (386 16/25mhz with soundblaster about £800-900 for unbranded/cheapo brands)
But as you point out not enough profit went back into R&D AND management was clueless so it would only delay the inevitable.
Now a question I have is....was there ever a Sega Genesis/Super Famicon rivaling Amiga Incompatible machine ever thought about around 91/92? Seems half the complexity was OCS compatibility and hence costs.
Say for example the 256 color C65 chipset?