In the midst of cultural upheaval in a large company, this doesn't seem like an unreasonable move, at least in the short term. I can see how the inherent disconnectedness of remote employees might make a general sense of disconnectedness worse for the onsite employees. If Yahoo! can redefine itself clearly, this "disconnectedness infection" would find a far less vulnerable host. (People that were hired under the assumption that they'd be allowed to WFH indefinitely have my profound sympathies!)