would recommend the book, A Case for Amillennialism, by Kim Riddlebarger, for a good understanding on this topic.
Dispensationalists are not even aware that there are other options, for the most part.
Here's what you must believe as a dispensationalist:
You must necessarily believe that physical death will continue to exist beyond the time of Christ’s second coming
You must necessarily believe that the natural creation will continue, beyond the time of Christ’s second coming, to be subjected to the curse imposed by the fall of man.
You must necessarily believe that the New Heavens and New Earth will not be introduced until 1,000 years subsequent to the return of Christ.
You must necessarily believe that unbelieving men and women will still have the opportunity to come to saving faith in Christ for at least 1,000 years subsequent to his return.
You must necessarily believe that unbelievers will not be finally resurrected until at least 1,000 years subsequent to the return of Christ.
You must necessarily believe that unbelievers will not be finally judged and cast into eternal punishment until at least 1,000 years subsequent to the return of Christ.
Here's an article which addresses the problems with each of these claims, by an ex-dispensationalist, Sam Storms.
By the way, the problem is not only with dispensationalists, it is a problem with historical premillennialism.
https://www.thegospelcoalition.org/...u-must-believe-if-you-are-a-premillennialist/