NEW YORK ( TheStreet) -- Coming soon from a mortgage lender near you: subprime loans. Really? Weren't they banished to the dustbin of history? Well, some types, such as the "liar loans" that required no proof of income, may be gone forever. But the idea of granting mortgages to people with less-than-perfect credit has a growing appeal for lenders. "It won't be unfettered and there will be restrictions, but frankly, subprime lending will have to come back," says Keith Gumbinger, vice president of mortgage-information firm HSH.com, in a report on the firm's website. Lenders' problem is that rising mortgage rates have made it unprofitable for homeowners to refinance existing mortgages, so refi applications have fallen off a cliff. Since refinancing has accounted for about two-thirds of mortgage applications in recent years, lenders must scramble to replace the lost business. Recent gains in home sales are simply not enough. cover the mortgage if the homeowner runs into trouble. Many borrowers, along with many in the real estate and home building industries, will welcome some loosening of the extremely tight loan standards implemented during the financial crisis. In recent years, lenders have required excellent credit scores, down payments averaging 20% and proof that income has been steady for years. Self-employed applicants, even with large incomes, have found loans very hard to get. But the pendulum isn't likely to swing back to where it was in 2005 and 2006, when applicants' credit ratings didn't matter and loans could be had for zero down. "Those mortgage loans were niche products to begin with and were intended for 2%of the market," Gumbinger said. "Unfortunately, they were marketed to 20% of the market, and that's when the problems started."