> Need I mention that any patents that existed on the 68060 have expired?
Yes, you absolutely need to as the 68060 was introduced 17 years ago while patents are usually valid for 20 years.
> Anybody with the time, inclination, and production capacity can produce 68060's now.
I think you're tremendously underestimating what it takes to exactly reimplement a chip (i.e. real one to one copy, not mere functional reimplementation in an FPGA) of the 68060's complexity without access to original data.