I don't know if there are any countries without one that NEED one...think of the major countries of the world - US, Canada, UK/Ireland, Brazil, Mexico, most of Continental Western Europe, Japan, Australia, South Africa, India...they ALL
have them, and multiple ones at that for the most part (I think one a day pops up in India!). Now we even have long-haul LCC's developing in JetStar, Oasis, and Zoom. There are lots of countries that may WANT LCC's...but need, that's another thing. However, I am probably missing a blatant one, so I allow corrections.