Admittedly, this is an apparent stretch, but this could be referring to a revival of Jewish resistance to the spread of Christianity occurring near the time of the Rapture. We are seeing something akin to that in our own day in the continuing efforts being made in Israel to quell proselytizing among the Jewish population, particularly by Messianic Jews. If so, it will prove to be merely a last ditch effort that will be overwhelmed by the turn of events at the Rapture and God's subsequent redemptive turn toward Israel. I think that could reasonably be described in the terms of the message: "I will make them come and bow down at your feet, and make them know that I have loved you."
Despite that, and whatever other trials they had to get through, the Philadelphians kept Jesus' word of perseverance. The thought conveyed is waiting patiently under command, like the person asked to stay behind for a straggler when the youth group heads out to an event. That Jesus' command to endure (as recorded elsewhere) has eschatological implications cannot be denied--the reference in this letter in conjunction with the promise of escape (rapture) can only underscore the end-times emphasis. The letter to the church in Philadelphia is in particular a message to the end-times Church, though its message would have been inspirational to any church at any time being stretched by the need to endure under pressure.