In other words, by not having ready a solution for prolonged major hashrate drop you people are working toward scenario where Bitcoin is likely dead.
The only way you'll see a major hashrate drop will be after Bitcoin is already dead.
On fundamental level, Bitcoin is no different than altcoins and that means you have no clue what you are talking about. Maybe to study alts a bit?
http://www.coinwarz.com/charts/difficulty-chartshttp://www.coinwarz.com/charts/exchange-rate-chartsP2Pool is trivial to setup and just becomes solo mining if the pooling part doesn't work for some reason (like a broken escalator becomes stairs), and it's already what everyone should be using.
...Not that setting up solo mining is hard.
Bitcoin mining community changed drastically lately, for the worse, you haven't noticed that?