If the Holy Ghost will remain here he will continue to be a restraint. If he isn't here to restrain, he isn't here to succor Christians, if there are no more people to be won for Christ, it is the end of the age.
Now, I recall something about the Jewish folks turning to Christ, hence, the Holy Ghost is still at work because (by the same theology that dispensationalism is built on) there can be no coming to Christ without grace and grace cannot flow without the presence of the Holy Ghost to provide the initial faith required to accept that grace.
The Rapture will not occur, it's that simple. The last trumpet is the last trumpet, not the last trumpet before the next trumpet, not the last trumpet related to this dispensation, but the last trumpet. People who honestly apply "the clear meaning of the Word" recognize that sooner or later unless they're skimming along and ignoring it all since see Christianity as just an insurance policy.
The fact is that Schofield knew good marketing sizzle when he saw it and built his sales of the public domain King James Bible on being the version with notes related to the Rapture when the Rapture was a hot new topic. As far as the "proofs" for it, they're every bit as thin and absurd as the bending over backwards Protestants do in order to deny the clear meaning of the Word as it relates to Peter.