Re: Ad Ecosystem
"Of course, you could just nuke it all from orbit and start over fresh..."
Good idea. Except maybe the last bit.
But to take your analogy further: I suppose what you're really saying is that sites that depend on advertising would be damaged along with the advertisers.
The advertisers themselves, as they currently operate, are no great loss. In fact, they're really no loss at all; their MO is to poke their fingers into user's eyeballs and maybe also ears. The rest of us would be better off without them. They may be doing themselves more harm than good in any case so they might actually be better off if their advertising channels were nuked.
So let's look at the sites. Under your Darwinian notion they have choices, adapt or die. They could adapt by allowing adverts in page and exercising direct control over what goes there. If they succeed in that they survive, if they allow the usual slow-loading, animated, screaming crud they die & if they allow malware they get sued to oblivion. But yes, they can survive.