Market Place; For Big Game Maker, Online Play Is a Big Gamble
Electronic Arts, world's biggest video-game publisher, flourishes amid high-tech woes; recent introduction by Sony, Nintendo and Microsoft of new gaming hardware drives industry growth cycle; company holds back new product to avoid cannibalizing sales of its other games during coming holiday season; success of The Sims Online, Internet-based game that will be released for Christmas sale, will largely determine who is right -- those making lofty predictions of Electronic Arts' future profitability while accumulating its stock, or its short-sellers; photos; stock-price graph; list of 10 most-popular video games (M)