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The date system seems more cumbersome to me.  The cons you listed are significant, and I find the range issue especially problematic.  My guts tell me "no."

Decimals seem cleaner to me, and the expandability is very useful.  And the example of Frederico's novel (when can I pre-order?) sounds perfectly workable to me as stated - I don't have a problem with it.  And it has the added benefit of being (relatively) easy to script for when working with this stuff in a database (for example).  Decimal system gets my vote.