[EpicEng]

You addressed zero of the concerns I mentioned. You seem to believe that any problem which occurs will be easily reversible and have no side effects. I can't imagine that would ever be the case. You did not address death (possible) or passing on genetics which have negative, perhaps unforseen consequences.

Alerting the human genome is not as simple as pushing a patch to a website.

[MiddleEndian]

Currently it doesn't work at all, and AFAIK only this one guy is trying it. If he gets an infection in an area covered by my insurance, I won't be too stressed about it.

If, in the future it is as easy as a $20 modification, I'd wager two things. One is that most people would use it for mundane things like resistance to the flu, stronger bones, and other things that would ultimately lower the cost of medical insurance on average. The other is that the mechanism will be so well known that changes will be rewritable.