Bonds are surely a good investment as they provide more interest rate than banks. But they would be temporary as we would see less and less bonds being issued in future.
The main economic problem for most of the world is there are no people and companies taking loans. They are not seeing enough economic opportunities for them to payback the loan with interest. It has resulted in accumulation of cash in banks and banks have nowhere to invest them. It's all due to the slowing down of economy. With continuation of this trend, the companies and governments would stop issuing bonds or issue them in much lower interest.