might be... I have not found numbers
the problem is "Amiga" (all variants) is designed as desktop and not for embedded market (AmigaOS/MorphOS would need desktop processors). So if at all someone invests money in PPC development it will be for embedded devices (where performance is less important). And if I would invest in embedded devices today I would invest in ARM propably. Processor development is risky and expensive and companies tend to invest in "security" and ARM today is the more secure bet.