If the product depends on a persistent relationship (ie- a subscription to WoW or even in the case of something like steam- You dont pay anything to continue using it, but the service depends on your continuing relationship) Then I think a EULA is binding- You are actually licensing something- The fact that the service is free isnt a issue.
However, the practice of licensing what should actually be sold will end. If you go to best buy and buy a copy of Tetris, for all intensive purposes that is a sale. There isnt any online environment thats needed. There isnt a subscription to it. Its just a purchase.
Anyways, to answer your question. I think the defining method of what will make something "eula capable" will be if it requires a continuing relationship. In the case of software, it might be simpler to say "Does this software require the internet to work" - If the answer is no, then its most definitely a sale and not a license.
Or you could just break the DRM in a country other than the US.
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Aside:
>for all intensive purposes
"intents and purposes"
I don't normally complain, but as you're into word definitions in your post it seemed apt.
I don't think this meets the standard of a continuing relationship. Couldn't you have them refilled at Wal-Green's? Or buy a lifetime supply?
With WoW, how many other vendors are able to continue providing an Azeroth for you to craft your wars?
The software you buy for WoW is clearly marked that it has no functionality outside of online play. It's client software that connects to the WoW "service" on Blizzard "servers." You are paying for the service, since you can download the same client software for free on Blizzard's website. I'm guessing that, like Eve Online, any retail purchase equals the equivalent game time.
Blizzard may be entirely within their rights to suspend your World of Warcraft account if you connect to their servers with a hacked client. But they still wouldn't have any legal right to control what you do with the bits on your own hard drive.
The pro-EULA argument is that they could claim that right either way.