According to the passage, one of the major problems likely to result from the new health-care plan is that

Since health care accounts for nearly one seventh of
the American national economy, any attempt to reform
it enters a minefield of explosive issues. President
Clinton's health-care plan, many experts say, might
shake up the health-insurance industry so violently
that it could shrink from about 500 to as few as to 10
companies; costing thousands of jobs. Businesses
complain that new health-coverage contributions
would be disastrous; there is even talk that up to a
million jobs will be lost as a consequence. Though the
American Medical Association has so far sent signals
that it would endorse the plan, the physicians
themselves and the taxpayers are extremely worried
about it.