Expectation, Empiricism, Habit

According to Hume, the pivotal component of his concept of Causality--the expectation that the Future will resemble the Past--is a 'habit'.  Now, the ostensible function for him of that derivation is to counter the Rationalist premise that the source of Causal judgments is Reason.  However, he seems unaware that it also suggests a fundamental shortcoming in his methodology.  For, according to his Empiricism, all non-Analytical Knowledge originates in Sense Impressions.  Now, a Sense Impression occurs in the Present.  But, Expectation connotes the Future.  Thus, Expectation cannot be explained by a Sense Impression alone.  Now, Habit is a species of Practice, independent of any mode of Cognition.  Thus, if 'Expectation' is meaningful in Hume's formulation, it can only be as derived from the Practical dimension of Experience, not, as his Empiricism entails, from the Cognitive one.