Mortgage crisis is the result of exceeding your own limits
Your limits are what you can afford all on your own, what you can do all on your own. Thus your true limits are a debit card instead of credit cards. Your limits for house construction are small houses you could even build all on your own with a couple of friends - paid all cash instead of paid by mortgage. If you live happily without any bank loans, mortgages and credit cards - then no global crisis of any kind can ever directly affect you - even less destroy your life by foreclosure, etc.
Mortgage crisis as currently ongoing is selfmade within all those affected as a result of appearing richer, bigger and greater than what they really are. Learn to live in small communities as shown here. Work harder and generation after generation your life may improve in a healthy and solid way - always paid cash in full for all you are and display to be. No farmer in a simple house ever has a reason to be ashame of his simple life - but each and everyone has reason to be proud to actually own what he has and to have achieved all he is as a result of his own work and efforts!