Not to be too much of a snob, but as they gain advanced degrees, the more foolish and indefensible aspects of the system tend to fall off. "Progressive" dispensationalism dominates the better and younger scholars, even among the dispi schools. And, Jacob, is correct, the sine qua non of dispensationalism has little to do with the Scofield schema. As the traditional Ryrie likes to opine: Dispensationalism = consistent differentiation between Israel and Church + "literal" hermeneutic with respect to OT prophecy.
Everything else is footnotes.
* a two track plan for God's people through the ages (Israel vs. the Church)
* a rebuilt temple and the reinstitution of bloody sacrifices during the millennium
* pre-trib rapturism