The pope can’t take us back “to a time when Jesus walked the earth” any more than the Delorian in your garage can do that. The Gospel speaks to us today, in the United States or wherever else you happen to be, in the last days of 2014. The Catholic faith isn’t an “emergent church.” It takes our own time head on and seeks to turn it towards Christ.
So any talk about “going back to the time of Christ” is pious-sounding nonsense that helps exactly nobody grow closer to our Lord, who is as much the Lord of 2015 as the Lord of 2014 and 1014 and 33 A.D.