My gut (non expert) feeling is that when 3D printing can be indistinguishable from natural, and quality assurance can make it reliably indistinguishable, we won’t need humans digging around inside us.

How long that takes I would only embarrass myself by guessing.

A benefit of cadaver disection is the range of anomalies like the penile implant, or finding hair and teeth in a random abdominal nook. Tough to imagine this benefit in 3D printed versions.