‘”Lets see the plain Scripture that Mary was assumed into heaven.”
Let’s see the Scripture where it says it has to be in Scripture...?” ‘
Lets say for the sake of this discussion that Mary was assumed into heaven. What does such an event convey about her that sets her apart from Enoch or Elijah who were also assumed into heaven?
Remember, if I'm not mistaken Enoch and Elijah will return so I don't think we can say their "time" is finished.
In a nutshell her assumption is and example and inspiration to the faithfull:
"The Feast of the Assumption has always been loved dearly by the faithful who are children of Mary. It is a sign to us that someday, through God's grace and our efforts, we too may join the Blessed Mother in giving glory to God. The Assumption is a source of great hope for us, too, for it points the way for all followers of Christ who imitate her fidelity and obedience to God's will. Where she now is, we are meant eventually to be, and may hope to be through Divine grace. Mary's being taken to heaven after her life on earth was ended is the logical outcome of her immaculate nature, uniquely protected -- also by God's grace -- from personal sin. We seek to imitate her self-sacrificing love, her indestructible faith and her perfect obedience."
Source - http://www.wf-f.org/Assumption.html
The short answer is, nothing. All these assumptions show us where all the righteous are going.