I'm expecting a mix of rainbow rushes, poison stalls and destroyer rushes, possibly some other intresting decks once in a while. No matter the 5 cards rule, you can almost always create one of those archetypes.
This is a very good point (along with the rest of your message). Perhaps one way to avoid this monotony would be to have a counter that tallies the use of every card in every deck of a particular T500 league, then gives the pay out for successful T500 decks based off some sort of logarithmic scale where lesser used cards are worth significantly more rewards to the deckbuilder. If this were the case, it would far less profitable to use a carbon copy deck.
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And while we are on automated deck analysis, it would be great if players could have more than one t500 deck running at a time, particularly if the cards in each deck differed by some set amount (say 40% different). I would hate to think that uber creative people could only have one great thing going at a time. (I would love to see what Jmdt could do unhindered!)
Peace - Lokiburn