As for SONY sustaining it,SONY is a pretty big company so they have alot of money from the past and also it borrows if it needs more and because it has such a great brand,lenders loan money easily. if sony continues to get these kinds of rating llike state in the article below , lenders will not lend so easily like you stated.
http://www.businessweek.com/news/2011-12-16/sony-rating-cut-by-fitch-on-losses-from-tvs-acquisitions.html







