doctor who - Why don't future humans use nano-genes?

In New Earth we see "The Sisterhood" (which are the future of human healing). This is about 50 billion years in the future, but a seemingly way better healing system was devised in only about 3000 years (5100); I'm referring to the nano-genes we see in The Empty Child and The Doctor Dances.

So my question is why don't future humans use nano-genes? Did they lose the technology due to the Doctor's "visit" there?

Answer

Humanity never really got the nano-genes technology to begin with, since the Doctor destroyed it before departing, as described in The Doctor Dances wikipedia page:

Meanwhile a German bomb falls onto the site, but Jack uses his ship to capture it and hauls it out into space. Then the Doctor sets the medical transport to explode once everyone is safely far from it, thus destroying the technology and matching the historical records of an explosion at the site.

This explain this apparent regression. If left intact, this technology would have modified the Earth's timeline quite heavily: we are talking about the Penicillin era :)

Comments

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