Bond guru Bill Gross told CNBC that the 30-year fixed-rate mortgage could fall as low as 4.5 percent as the economy stabilizes.

"The mortgage rate will come down another 50 to 100 basis points," Pimco's founder and chief investment officer said. "That's basically what the government needs. They need a 4 1/2 percent to 5 percent 30-year rate in order to support home prices and, yes, to encourage refinancing and the process of reliquification within the economy."