Well, I was only kidding. However, since you decided to take a shot,,,is the Jewish tradition that there is a potential messiah in every generation a "fabrication?" And, if not, can you cite the Scripture which supports it?
Don't have to cite a scripture. We can choose to embrace or reject tradition. The talmid is not a magesterium to the "non-orthodox" Jew. There's also a tradition that the Sons of Jacob won battles by roaring like lions. I choose to reject that one. Nice try.
As I said, it is equivalent to theological speculation. There are several different schools of thought in Judaism as to when moshiach will come. His coming is tied in with the End of Days, although even this is subject to some debate. Some say, for example, that these things will happen after the world has fallen deeply into evil. Others say it will be when enough people have repented. This latter view finds support in the following verse:
And he will come to Zion as redeemer,
to those in Jacob who turn from transgression, says the LORD. (Isaiah 59:20)
When Jacob turns from transgression, God will redeem his people, and send moshiach to be their king.
Since, at least in theory, it is possible that this turning from transgression could happen in any generation, then it follows that there must be in each generation someone who could potentially be moshiach.
As I said, though, this is but one theory as to when moshiach will come. All the different schools of thought agree, though, as to how we will know he is the one.