Yeah, that's pretty much how I was thinking of it. Enormous effort, even if you do get to use evolution. And consider the whole cycle of building a web page; organically retrieve a file, organically open a connection to a database (with an organic protocol, of course) to organically retrieve some organic data, organically convert it to some sort of organic representation (HTML is too rigid, we'd need some sort of probabilistic representation or something) and organically render it in a browser; the complication is simply enormous and the payoff? For enormously more computational power, you have a net decrease in the reliability of the whole process.

I could see how AI could use such a thing, especially since the best intelligence we know works that way. But in general? It seems less than awesome.