Replying here instead of direct PM since it's the same question.
As Henning stated, you will only get a good feel on the # of records in a data unit by performing an import. Trying to size based on multiplying # of members in each dimension is impractical as it is unlikely that you will have values for every possible combination of members from each dimension.
And to add to what Henning stated, there are more than a few dimensions that you shouldn't use for attempting to calculate the max possible # of records. From your table, I would remove Scenario, Entity, Consolidation, View, Year & period (assumed same time dimension) and Currency (assumed it's handled in Cons dimension).