Efforts to keep underwater borrowers in their homes will only delay the inevitable 20% drop from current price levels, writes Gary Shilling in INSIGHT.

The massive overhang of excess house inventories—the mortal enemy of prices—suggests another 20% fall in home values, resulting in a 43% peak-to-trough total decline.

We estimate that excess house inventories exceed 2 million, a huge amount. In addition, Census Bureau data suggests at least 500,000 housing units have been held off the market by owners who want to sell but are hoping for higher prices.

Further price weakness will probably convince many of them to dump their properties on the market for whatever they’ll bring.

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Furthermore, the government-imposed moratorium on foreclosures during the Home Affordable Modification Program is essentially over. HAMP aided only 521,630 borrowers, compared with the hoped-for 3 to 4 million—and frequently left borrowers further under water.

Also, the lender-imposed moratoria on foreclosures during the robo-signing flap are unwinding as proper documents are prepared. So foreclosures are resuming, as delinquencies remain high. And when banks and other lenders foreclose on properties, they usually want to sell then immediately, often at market-depressed prices.

Foreclosures Are the Answer
Massive foreclosures would actually help to revive the housing market. The subsequent sales of those houses at low, distressed prices would set a floor, and the foundation for a self-feeding rebound that would restore confidence to the market.

That's what happened two decades ago, when the Resolution Trust Corp. sold the busted savings-and-loans and related securities and properties.

In contrast, mortgage modifications have proved a dismal failure. Modifications often simply drag out the loss of abodes for distressed homeowners.

Houses in the process of foreclosure drag down prices of others in the neighborhood. Empty houses are often vandalized, and homeowners in the process of foreclosure are unlikely to replace dead shrubs. Banks will probably remain reluctant to make new mortgage loans as long as they own piles of delinquent mortgages.

Unfortunately, there is a concerted national effort to keep distressed homeowners who can’t afford chicken coops in four-bedroom houses on which they put zero down. HAMP is one example of this.

Another is the proposed deal between the multitude of regulators and 14 mortgage servicers that didn’t follow correct technical procedures in initiating foreclosures.

Next: The $20 Billion Mistake