Frost,
I'd like to first commend you on your question. Concerning 1 Cor 1:7-8 you said:
"It sounds to me like the Corinthians were expecting something dramatic (something tangible, or physical, not spiritual,) to happen when he returned."
You're already way ahead of most futurists--most futurists entirely miss (or spiritualize away) the stark reality that it was the first-century Corinthians themselves that were expecting this return, and none less than the apostle Paul himself was teaching them to expect this.
To answer your question, the judgment associated with Christ's Parousia was not merely restricted to the land of Israel or Jerusalem (although that was the center). Disasters were going on all over the empire as God's wrath was being poured out. While preterists often turn to a slew of historical resources to show the famines, city-sized destructions from earthquakes, and empire-wide wars that were breaking out by God's design, we need only to look in our bibles to see how the churches around the empire were being affected at that time:
--THE END-OF-THE-AGE TRIBULATION--
* world-wide famine (Acts 11:27-29)
* plagues (1 Cor 11:29-31)
* world-wide suffering of the church (1 Pet 4:7,12-13; 5:9; 2 Thess 1:4-6)
* judgment upon the empire's kings/rulers (Acts 12:1-4/19-24; 23:1-3; 24:24-25)
* the apostasy (book of Jude; 2 Tim 1:15; 2 Tim 4:16)
--THE RELIEF PROVIDED BY CHRIST'S PAROUSIA--
* Christ's Coming to First-Century Thessalonica
promise: 2 Thess 1:6-7
result: their persecutors would be cut off, ending their persecution
* Christ's Coming to First-Century Thyatira
promise: Rev 2:18-25
result: their false prophetess and all her followers would be killed off by
Christ's coming. The Church was granted Christ's authority.
* Christ's Coming to First-Century Pergamum
promise: Rev 2:12-16
result: the heretical Nicolaitans were to put down by Christ's coming to
Pergamum. The Nicolaitans that were causing them to break the decree of the Council of Jerusalem were killed (Rev 2:14; cf. Acts 15:28-29).
* Christ's Coming to First-Century Sardis
promise: Rev 3:1-5
result: Christ promises them that his "thief-in-the-night" coming will come
upon them. They had not been faithfully expecting "the thief" as explained to them in Matt 24:43/1 Thess5:2-5. However, a few in Sardis were found worthy and had not soiled their garments. At Christ's coming to them "they walked in white, for they were worthy" (Rev 3:4-5).
* Christ's Coming to First-Century Philadelphia
promise: Rev 3:7-13
result: Christ puts down the then-contemporary Jewish persecution (3:9).
He preserves the Church at Philadelphia through the testing which was then about to come upon the whole empire (3:10). God makes his faithful ones "pillars" in the Temple of God.
* Christ's Coming to First-Century Laodicea
promise: Rev 3:14-21
result: Christ is shown to be knocking at their door as first promised in Matt 24:33 (cf. also James 5:9). If they didn't repent it appears they were annihilated. Repentant and obedient followers said to become partakers of Christ's heavenly authority.
I could add many other things, but this will do for now. It is clear that the scriptures contain the historic record of the tribulation period, and they explain the relief that Christ's Parousia brought to the churches around the empire, precisely as they were promised. Christ did not fail them.