Offline PvE

I spend an hour a day on the subway. It would be great if I could do some of the PvE type events, or even queue up the PvP events and play them while underground. I can see how PvP matchups and the scores could be a problem, but I notice that a list of people to skip is downloaded. I can also see how it could be a problem with rubberbanding in PvE events, but again things could be synced and points given then. Has this been considered? Is the population of subway riders too small for it to be worth the dev time?