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The announced shutdown of "The Oprah Winfrey Show" in two years creates room for a new queen (or king) of daytime television.

Until that day when Winfrey's 7 million or so daily viewers start looking for something else to do, preparing to claim that audience will be one of the biggest competitions in television.

"You haven't had a time period like this open up in 25 years," said Larry Gerbrandt, an analyst for the firm Media Valuation Partners in Los Angeles. "It really gives the players a chance to reshuffle the deck."

Nowhere now in daytime television is there a show with the breadth of Winfrey's, which can feature an interview with singer Whitney Houston about her drug use one day, or Sarah Palin about a contentious campaign the next. She can do a serious hour about domestic abuse, bring Tom Cruise on to jump on her sofa, host a party with the Black Eyed Peas or give away cars to everyone in her audience.

The two shows closest to Winfrey's in the ratings are hosted by her protégés, Dr. Phil and Dr. Oz. Yet "Dr. Phil" has been around a while and the ratings indicate viewers are starting to tire of his form of tough love.

"Dr. Oz" was a breakout hit as a newcomer this fall, but its appeal as a health-oriented show is limited. Winfrey only had him as an occasional guest, and there are questions about how many people want to see him every day.

Both, however, will have restrictions removed from their contracts that prevented their shows from airing at 4 p.m. each day — Winfrey's preferred time slot and generally considered the key time in daytime TV because more people are available to watch, said Bill Carroll, an expert in the syndication market for Katz Television.

Winfrey has a financial stake in both shows, so if their audiences increase because she leaves, guess who benefits?

Strictly from a business standpoint, then, it seems odd that Winfrey has given signals that appear to be anointing DeGeneres as her chosen successor at the top of the heap. They've traded appearances on each other's shows recently and guess who's posing next to Winfrey on the latest cover of "O, The Magazine"?

"Ellen is probably in the best position to move into that role," daytime TV host Jerry Springer said.

DeGeneres' breezy show is primarily entertainment-oriented and less varied in topic than Winfrey's. But it has a greater potential to be broader than many of its rivals, and her profile should only increase with her upcoming role on "American Idol."

"Guests won't be afraid to go on Ellen," Springer said. "Any edge she might have is neutralized by her humor. She can be light yet she's obviously very bright. If you're looking to sell something, like a book or a political idea, you're not going to get beaten up by going on her show."

Television stations that have been reluctant to air DeGeneres' show at 4 p.m. for fear of competing with Winfrey would be much more willing with that roadblock gone, and her syndicators will be pushing to put her in that slot.

For all the promising signs for DeGeneres, her show still doesn't have as large an audience as "Dr. Phil" and "Dr. Oz." And she should be wary of another formidable competitor: "Judge Judy." The courtroom program isn't a talk show but is strong in the ratings in the late afternoon. There's no guarantee that Winfrey's old viewers will gravitate toward a talk show, or television at all. Daytime TV ratings have been sinking steadily over the years with more women in the work force, and Winfrey's exit could accelerate the decline.

Other competitors are Rachael Ray, an appealing personality whose show now takes a lot of morning slots, and Tyra Banks, who appeals to younger viewers. Meanwhile, a Winfrey protégé, makeover artist Nate Berkus, is readying his own show but there are questions about how limited his appeal would be.

"I'm sure there are people on the phone to their agents saying, 'Get me a meeting, I'm the next Oprah,'" Carroll said. "I would advise them to look up (failed daytime host) Jane Pauley's phone number. Wanting to be that and doing that are two different things."