Yahoo is starting to act like some old media players. It is helplessly bogged down in restructuring and refocusing strategy, missing Wall Street expectations, and dodging the perils of an economic downdraft. Its stock has fallen through the $20-a-share threshold that makes it a prime takeover target. Half of its diminished $25 billion market cap is investments in other public companies. Ironically, Yahoo's predicament is as much psychological as it is financial.