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For one thing it will probably drastically reduce the number of applicants. More importantly perhaps, is it will force people to come up with viable ideas for products that get sold directly to the end-user rather than just expanding the number of advertising channels.

Web 2.0 fails because there is no business model. Ad revenue works for some businesses, but for the majority it doesn't (they live of VC funding and hope for an acquisition). There is also little chance that you could attract enough sustainable traffic in 90 days to create a worthwhile revenue stream.

Sure, this rule will filter some false positives -- but on the whole it will surely give him a more interesting (and easy to evaluate) set of ideas.

An out-lier does not a trend make.