No dispensationalism does not assert there are separate paths of salvation. You might find some hypers assert that but the majority clearly see saved by Grace through faith for all times.
The belief involves an unfulfilled unconditional Promise to Israel for God’s Glory. All promises are through the seed of Abraham and fulfilled through the shed Blood of Jesus Christ.
I agree that all promises were fulfilled in the single seed of Christ:
"Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ." (Gal 3:16 KJV)
There was nothing unfulfilled. Besides, Israel broke the land covenant with God. Recall this:
"But if ye will not drive out the inhabitants of the land from before you; then it shall come to pass, that those which ye let remain of them shall be pricks in your eyes, and thorns in your sides, and shall vex you in the land wherein ye dwell. Moreover it shall come to pass, that I shall do unto you, as I thought to do unto them." (Num 33:55-56 KJV)
God said he would do unto Israel what he thought to do unto the nations they failed to drive out. In this passage God explains what he thought to do unto those nations, which was to destroy them:
"And it shall be, if thou do at all forget the Lord thy God, and walk after other gods, and serve them, and worship them, I testify against you this day that ye shall surely perish. As the nations which the Lord destroyeth before your face, so shall ye perish; because ye would not be obedient unto the voice of the Lord your God." (Deu 8:19-20 KJV)
The only "land covenant" remaining was the land promised to Abraham, which is heavenly (Heb 11:12-16.)
Philip
No dispensationalism does not assert there are separate paths of salvation.
Some are more consistent that others.
The way I have heard it, with my own ears, involves separate eternal destinies. And, of course, separate promises. This from a man involved at the time (he's dead now) in some way with LaHaye's pretrib group.