About 95 percent of the rewired bacteria did just fine with their new networks. They went on with their lives, feeding, growing and dividing. Some even performed better than microbes with the original wiring, under some conditions.

The tolerance these bacteria showed reveals something important about how evolution works. Humans can randomly rewire cells, and so can mutations. There's something about gene networks that allow them to thrive despite these mutations, and, in some cases, to even gain an edge in the evolutionary race.

we have got millions of our own things to do! Why to interfere in God's work too? :O)
Seriously, some things should be left alone without interference. Genes are the first among them.Who knows what we may end up with?

The More We Know About Genes, the Less We Understand

I'd say that goes for just about everthing.

Just a thought
... after millions of years of evolution the network must have reached some kind of a "steady state" - with very small sensitivity to perturbations.
Random mutations introduced in the form of "re-wiring" might have not been enough to kick the network, as a whole, out of it's order.