Rupert Murdoch could never be faulted for not being ambitious: at Goldman Sach’s Communacopia conference today, he said that WSJ.com’s online subscription revenue will increase by $300 million per year over the next several years. The site just relaunched this week, and even though exact revenue figures are not available, estimates on sub revenues are around $80 million per year. This means it would have to increase current prices (which Murdoch has previously said they would) and also bring in lotsa new subscribers into the fold. He also has big hopes on ad revenues from the site even though it remains a hybrid site: he said WSJ.com could generate $100 million annually in advertising revenue, and that the company is charging $100K a day for advertisers on its home page.

As for MySpace revenues, he said advertisers are charged an average of $500K per day for space on its home page, and up to $1 million.

On Google-MySpace deal (picked up by SAI): “It’s going fine. They knew they wouldn’t make the $300 million the first year, and they wouldn’t make it the next year, and by the third year they’ll be very close. But take a look at the market out there. If they didn’t renew, Microsoft (NSDQ: MSFT) would be out there in a minute with a big check.”

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