The WTS has made a point of praising Jesus for his teaching style, specifically that he used clear, simple language and parables that the common, largely uneducated audience that he was addressing could easily understand. If we grant them that, that Jesus was able to frame his message in terms that were clearly understandable (and that certainly is the way the bible portrays him), then it is inconceivable that their current "light" is even remotely close to what Jesus meant by "this generation". It's laughable. It is not what "generation" means, pure and simple. They might as well explain the passage with Bible Code-esque counting of the spaces between the letters.
Imagine someone trying to use the word generation the way that the WTS is claiming Jesus was using it. Imagine, for example, a 98 year old woman speaking to her 14 year old great grandson:
Great grandma "Wow, this generation sure is stubborn!"
Great grandson "Which generation?"
"You know. Ours!"
"Yours and Great Granddads?"
"No boy! Yours and mine. You know, the generation that remembers when cars were rare and that invented Facebook. The generation that fought two world wars, the Korean war, Vietnam, and two Gulf Wars! The generation whose parents were gold prospectors and hippy radicals at woodstock. The generation that saw man first walk on the moon and can't remember a world without the internet. You know, our generation!"
"OK grandma. Lets get your pills..."
There is absolutely no rational definition in which my generation, those born in the mid seventies, are the same as the generation that wept at the Beatles playing on Ed Sullivan, let alone the generation that remembers when indoor plumbing was optional.
Attention JWs: it isn't a code. You were just wrong, and your more and more far-fetched apologism is just getting embarrassing now.