What a laughable argument, lose all commercial developers because Windows is available.
A strange argument at best. 68k needed to die (according to some) and the 'players' involved made sure it did exactly that. PPC was the deemed future, not a much faster 68K running on widely available / inexpensive x86 hardware. (makes way too much sense) So since then, any major momentum in 68k was snuffed.
Meanwhile, 68k is still alive despite the 'players' wishes and their many actions. People run the original hardware or emulate it on a variety of hardware platforms. And it does still recieve software and hardware development! Many thanks to those continuing to make these things 68K things happen.