The more I read the scriputres, the more I am beginning to believe it was written by lawyers!. There is not a single word in it that doesn't have more than one meaning.
I certainly agree that “this generation” applies to the generation in our era in the hear and now which saw Israel become a nation gain in a day in 1948 and will be around, at least as representd by some memember(s) when the concluding & related prophecies are fulfilled.
Yes, God has embedded plenty multiple meanings and mysteries in Scripture.
I believe that He expects Holy Spirit to lead each individual in a fuller understanding of such passages. This would also require each individual to be in close ongoing dialogue with God to receive such insights from Holy Spirit. Certainly that is also a very Scriptural goal and Godly high priority.