(Bloomberg Politics) -- A new analysis of a Republican proposal to temporarily continuePPACA premium subsidies if the Supreme Court erases them warns thatit would "only delay" the onset of higher insurance premiums andloss of coverage for potentially millions of Americans.

"Even if a temporary extension of premium subsidies would helpavoid disruption in the short term, it is likely that thedisruption would be only delayed, not avoided altogether. If thesubsidies are ultimately eliminated, potentially millions ofindividuals will drop coverage and premiums will increasesubstantially," the brief by the American Academy of Actuaries said, "unlessother equally strong mechanisms are implemented that wouldencourage participation by a broad cross section of risks."

The analysis evaluates ideas in a bill put forth byWisconsin Sen. Ron Johnson and 31 Republicans thatwould preserve—through August 2017—the Obamacare premium taxcredits that some 7.5 million Americans might lose if the SupremeCourt rules against the government in King v. Burwell nextmonth.