first off: I'm very sorry to be a grave digger. But I have this (already solved) incident in my mind since I read about it, which was quite a while after it occurred.
Now, I thought about what would happen if the one who generated that transaction had malicious intents. Let's make a thought play:
Transaction was made and someone - let's call him Bob - now holds more than 184bn BTC in his wallet. Knowing the transaction will be detected soon, Bob is in a hurry.
He moves his coins over to an Altcoin exchange and sells whatever he can for Altcoins, crashing the price of e.g. Litecoin, DASH and what not else.
Now, Bob moves his fraudulently generated DASH, Litecoin etc. to his wallets. He has made one hell of a gain, waiting for things to calm, so he can sell his Altcoins back for Bitcoin.
Meanwhile, the incident was detected and five hours later, a "rollback" - the hardfork - was decided upon and done.
What happens now? The Altcoin exchange has some serious trouble: many, many users now have sold Litecoin and DASH for Bitcoins which don't exist, anymore. As the exchange isn't able to pay (let users withdraw their non existing BTC), but the Altcoins are already withdrawn by Bob, what would happen next?
Would that just be a "shit happens" situation, or would the Altcoins which are affected also be forced to do a hardfork?
Anyone who is interested in continuing this thought is welcome to do so!