You can build your business in such a way that it works with or without Google, but it's going to work a lot better with Google than without it.
People do lose sleep over rankings, because in some industries, the amount of traffic and business generated by organic search is substantial. If you're relying almost entirely on Google search traffic, you are doing it wrong, but if you're ignoring organic optimization, you're also doing it wrong. Telling people who may be making many millions of dollars in revenue from organic search to just "treat it like the weather" is horrible advise. I think I know what you're saying, build up other traffic channels, but the way you're phrasing it makes that harder to see. At some point as marketing grows, most websites start branching off into many, many different areas -- paid, social, email, etc. -- but organic search is still a big part of the mix.
Panda and Penguin finally backed up what Google had been saying for years. The problem is that there is always a gap between what Google says to do and when Google chooses to specifically enforce what it had been saying. In the meantime, lot's of people exploit that gap.
The best long-term move is to do what's right, but when you see cases like this, you really lose trust in how Google is treating websites.