[lgg]

No, it is actually (mostly) correct. In ST:TNG they redefined the definition such that it is infinite. It was documented in the Star Trek: The Next Generation Technical Manual, which was published in 1991 and was written by the technical advisors for the series, who based it if the internal series technical bibles[1]. This was a distinct change from the original TOS which they never explained or formally retconned, but for all the series in that era it holds.

That was the standard scale used ST:TNG, ST:DS9, and ST:VOY with the notable exception of All Good Things. Obviously the point was to convey to the audience "Hey look, in the future things go much faster." Unfortunately they had originally chosen a scale that doesn't make that obvious to most viewers (it is not intuitively obvious that Warp 9.999 is substantially faster than Warp 9.99[2]). At a practical level it also very inconvenient to have a speed scale where all of the speeds share the same prefix (IOW, it is much easier for the captain to call out "Warp 9" and "Warp 12" then it is is to call out "Warp 9.99" and "Warp 9.999."

I choose to believe that the in the All Good Things timeline that once Federation started building ships that consistently exceeded 9.9 they came up with a modified scale that had better resolution and was easier to use, but that doesn't change the fact that Threshold (despite being terrible) is actually consistent with the existing source content and All Good Tings is not.

1: http://memory-alpha.wikia.com/wiki/Star_Trek:_The_Next_Gener... 2: http://memory-alpha.wikia.com/wiki/Warp_factor