you can bet it's not universal
They might think this will be a company edict, but there are going to be those people who won't start commuting and Yahoo will make exceptions. If they had a senior developer with years of experience on a critical system who said he/she would leave if forced to commute does anybody really think they'd keep an arbitrary rule in place? Like the saying goes - "rules are made to be broken". This isn't a law, it's just a dumb idea that they could have managed much better by simply managing effectively.