The trick for both companies and individuals in down turns is adaptability. Some people will say "stay put!" other will say "find your next job quick before it's too late", but you can be sure of neither of these.
The only dangerous plan is to try to find stability in unstable times. This is a trap a lot of people fall into.
Make sure your resume is up to date, think about what's important to you, and keep any eye on where the world is evolving. A lot of career changes happen during down turns so don't expect to do what you're doing this year next year. This is more true the more severe the situation. The key to survival if it gets that bad is not hesitating to adapt and try something new, this is also the key to finding success in these times if you're looking for more than survival.
Of course, this may not be necessary if you have 3x your yearly expenses in investments you can cash out if needed, but better safe than sorry.