Blizzard patched it to be on the safe side. I even got into a lengthy discussion with someone on battle.net forums about the software engineering side of things, which partly explained the rationel behind the decision. Better safe than sorry, in a nutshell. I don't there was much else to it.
Anyway, SC is finite. With careful enough research and testing, it should be entirely possible to determine what parts of the EUD's memory access range are safe, and which arn't (code pointers, etc.). From there, it would be a relatively simple matter to restrict those unsafe portions, at least until they become mapped out and determined as safe or not.
I think it's still worth going for. Even if EUDs won't be as widespread because of the patch, it would be great for larger map releases to still be able to do these things. If there are maps made that are worth playing that use EUDs, people will start to use them again. Hell, maybe even I would use them, so long as Blizzard doesn't step in to stamp them out again.

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Congrats on post number 1000, Tux.
EUD's were a tool, nothing more. We still have many avenues open, and can always downgrade versions and play via modem or LAN connections if we truly feel a desperate need to play using EUD actions. Or a possible private server could be created which used 1.12...?