I believe that Revelation 3:10 indicates a pre-tribulation rapture for those of Philadelphia who "keep the word of His patience".
Check any historical commentary. Scholars know that John was told to send letters to *contemporary churches* of his own day. He was not projecting into the future, unless you suppose that this is simply a blueprint the Holy Spirit was giving the entire Church across the entire NT age?
I kind of like the idea that the 7 churches of Asia Minor were a "blueprint," devised by God as a sort of representation of conditions the Church finds itself in every generation across the world. But in reality, if we are to properly interpret a biblical passage, we must begin with the actual meaning, which obviously referred to 7 historical churches that existed in John's time.
Clearly, the church of Philadelphia was an actual historical church. And it did experience the wide-spread tribulation that occurred at that time, and was exempted from it. Other churches, existing at the same time, apparently were not exempted from it. Other churches, like Smyrna, were called, by God, to suffer for the glory of Christ, and not be exempted from it. Each church had its own unique trials, and its own unique means of displaying Christ's glory. Some suffer, and some are delivered--both bring glory to Christ in their own way, if they submit and are obedient to God's word.
That's my take on it. There is no explicit theology of universal deliverance for the Church. The only thing the Bible guarantees the Church universally is deliverance from the eternal Wrath of God. We are never guaranteed absolute deliverance from trials, from persecution, from tribulation. In fact, the Scriptures assert the opposite!
From Barnes Notes on the Bible
Which shall come upon all the world - The phrase used here - "all the world" - may either denote the whole world; or the whole Roman empire; or a large district of country; or the land of Judaea. See the notes on Luke 2:1. Here, perhaps, all that is implied is, that the trial would be very extensive or general - so much so as to embrace the world, as the word was understood by those to whom the epistle was addressed. It need not be supposed that the whole world literally was included in it, or even all the Roman empire, but what was the world to them - the region which they would embrace in that term. If there were some far-spreading calamity in the country where they resided, it would probably be all that would be fairly embraced in the meaning of the word. It is not known to what trial the speaker refers. It may have been some form of persecution, or it may have been some calamity by disease, earthquake, or famine that was to occur. Tacitus (see Wetstein, in loco) mentions an earthquake that sank twelve cities in Asia Minor, in one night, by which, among others, Philadelphia was deeply affected; and 'it is possible that there may have been reference here to that overwhelming calamity. But nothing can be determined with certainty in regard to this.
