One bailout was not enough for Citigroup. And it may not be enough for other big banks.

While Citigroup’s second multibillion-dollar rescue from Washington hit Wall Street like a shot of adrenaline on Monday, many analysts worried that the jolt would soon wear off. Citigroup has been stabilized, but the outlook for the financial industry as a whole is bleak.

With the red ink deepening, other banks may eventually turn to the government to soak up some of their losses. Taxpayers could end up guaranteeing hundreds of billions of dollars of banks’ toxic assets. Indeed, Treasury Secretary Henry M. Paulson Jr. is expected to announce a new plan on Tuesday to bolster the consumer-finance market.

“When all else fails, government does come in,” said David A. Moss, a public policy professor at Harvard Business School.

On Monday, Wall Street put aside its worries, at least for a day. Citigroup’s share price, which had plunged to a mere $3.77 on Friday, shot up to $5.95. Shares of its biggest rivals  banks which, with the government’s help, are emerging to dominate the industry  also soared. Bank of America jumped 27 percent, JPMorgan Chase leapt 21 percent and Wells Fargo gained nearly 20 percent.