You forget TWO facts:
Many, many, many, many, many, many, Amiga-Users for many, many, many, many, many years have used 68000 or 68020 powered machines!:
Motorola has failed provide a cheap (compared to X86) upgrade path for 68k during the early 1990s, thus Amiga users are stuck on 020/030 CPUs.
Why didn’t Moto offer a 66/75/80 Mhz 030 (with built in FPU) part? (Completing with 486DX2/DX4/ price bracket).
Due to Moto incompetence, most of 68k based PCs are gone from mainstream view. (Moto’s 68k empire is basically gone from the general PC market.)
Moto did not keep up with Intel/AMD in terms of price and performance at a given time period.
The CPU vendor is pretty much the central node for the success of the particular PC platforms.
X86 empire has a double insurance of at least two aggressive CPU vendors (mostly due to IBM’s decisions in forcing Intel to give early X86 designs to AMD within the original X86 PCAT contacts).
It’s sad to see that PPC Alliance basically reduced to one aggressive CPU vendor (e.g. IBM).