Time for Mayer to step down at Walmart?

We’ve wondered before — and so have investors! — whether Yahoo CEO and Walmart director Marissa Mayer is too busy to be an effective member of the Walmart board of directors.

While Mayer is still stretched thin across a variety of corporate and non-profit boards, a fellow Yahoo director has decided to pare down his portfolio and make his full-time job his priority: Last week, the Silicon Valley Business Journal reported that John Hayes, who has served in Yahoo’s board since 2012, will step down from his directorship in June in order to focus his time and energy on his job as Chief Marketing Officer at American Express.

Might Marissa Mayer want to take a cue from Hayes and step down from the Walmart board to focus on Yahoo? After all, Mayer’s already difficult CEO job is about to get even harder: Yahoo’s successful investment in Chinese e-commerce company Alibaba has driven stock price increases during Mayer’s tenure, so Yahoo investors have been happy to sit by, watch their shares increase in value, and give Mayer extra time to improve Yahoo’s struggling core operations. But now Alibaba is planning an IPO, so Mayer will face increased scrutiny as investors expect her to deliver results based on Yahoo’s business alone.

What do you think?