That's a very slippery slope. Kik is an app and company that has been going on for years. It existed long before Azer's "kik" and, even if Azer does not know what it is, most people know "Kik" as the phone app and not the bootstrapping tool.
To extrapolate this incident to "companies will start snatching up three letter names, and nothing will ever be able to use a three letter name" is ridiculous.
Kik is a messaging app, kik is a node module. Was someone going to call up the app store and install a node module? Was someone potentially going to install a messaging app into their node project?
I associate Kik with a textile discounter. Just because they are known by parts of the population and have copyrights in some countries, do they really have the right to claim their name pretty much everywhere?
It's not copyright, but trademark (it's a subtle, but important distinction). And for trademarks, the short answer is it depends. Some trademarks have no protection (generics or ones that become generic) and others have infinite protection (famous marks, like Apple and Disney). While most have protection in their field (think the word Mac, it's a computer, a burger and a cusmotic brand).
Field however is hard to define, for example Trademark offices have categories and theoretically, you cannot have 2 trademarks owned by 2 different entities. That said, it does happen, because the "fields" are actually defined by likelihood of confusion, which is shown in court. If this is all confusing, it is.
But long story short, if your mark is famous (and kik's would be considered famous), you're the only one allowed to use it, and you HAVE TO in force it, otherwise, you lose it.
To extrapolate this incident to "companies will start snatching up three letter names, and nothing will ever be able to use a three letter name" is ridiculous.