Rather, Millennium and ST'09 were both based on plausible science and quantum theory. The Reeves-Stevenses have always been among the most hard-science-oriented Trek novelists, and Kurtzman & Orci are pretty sciene-literate themselves. The multiple-timelines model is the one that actually makes scientific sense. Not in that case. What I asserted was that the reconvergence only happened if there was a two-way interaction between the timelines, if matter, energy, or information was exchanged in both directions. In that case they were mutually "drawn" into alignment. But if the exchange was only one-way -- if, say, someone fell through a black hole into another timeline and nothing came back in the other direction (because nothing can come out of a black hole) -- then both timelines could survive, although the altered timeline could be influenced to evolve in a similar direction to the original (say, by having the same bunch of people coincidentally end up meeting each other and serving on the same starship).