I think Dr. Walvoord does a great job of explaining how amillennialism was not the view of apostolic era Christians, or the century immediately following. The view held was premillennial.
Thanks for the ping. Walvoord has laid it out rather plainly. If there is no coming millennial reign by Christ much of scripture would have to be ignored or unduly allegorized. Those who claim the millennium is Christ reigning now would have to restrict Him to reigning over only a part of the universe.
Those who deny a one thousand year reign of Christ ON earth ruling the nations with a "rod of iron" have the burden of determining when to allegorize far more Scripture than the literalist does. The early believers were looking for an imminent return of Christ and was why Paul warned some in Thessalonika, who had sold everything they had and sat around waiting for Christ to come back, forcing others to work to feed them. He said, "If a man doesn't work, he shouldn't eat.". But I believe they ALL understood that Christ would return and would set up His millennial kingdom.