Why would that matter? They can set up a similar service and use the wosign ca and Mozilla/google wouldn't know anything is amiss
tl;dr - WoSign/StartCom are no longer trusted as a CA (at least by Firefox)
Mozilla stated that they will not distrust certs issued with notBefore till December, so theoretically this cert is good for as long as it's still valid, only after that they need to worry.