yeah, but it was still compatable. I think commodore cranking out the 68k equivalent to the z80 would make sense.
by the time aga came around mostecs chip fab was still in the 80's they had to outsource aga (denise?) because they couldnt make it. they could produce 16bit cpus if they tried as well as ocs, ecs, dumb frame buffers, and memory controllers but anything else was beyond their capabilities.
the vertical-integration of chip-fab and computer manufacturer was good in the 80's but commodore held mostec back. by 85 they should have had a 16-bit 6502 by 90 a 32bit etc. instead for years they spit out varients of the 6501, 6502, 6510, 8510 etc. etc.