The situation: A < 2k rep user suggests and edit, which is then approved. They gain +2 rep for this action. Later the edit is rolled back. Does the +2 rep disappear?
Related but not an answer to this question: this post.
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To answer your primary question: no, a rollback does not cause a reversal of the reputation gained (although some people wish it did). The only thing that will cause you to lose reputation from a suggested edit is if the post gets deleted*.
* However, this isn't true for orphaned tag wikis since they never actually get deleted; they just float off into imagination land.