I suppose you could make up some kind of technobabble argument for the hyper-evolution thing, but it's just really poor writing.
Like they said "Obviously the show can't end so we need a reason they can't go warp 10 again. Alright, pick a horrible fate out of the hat! Super-speed evolution! Let's go with it."
The problem with Threshold is not the ridiculousness level, as plenty of other better episodes have an equal or greater ridiculousness level. The problem is it's just poorly plotted. They took the most predictable Voyager concept of "Hey we have a way to get home!!!...nevermind" and went the dumbest direction at every story juncture. Then they did it in a way that gave Tom Paris too many special skills that frankly other characters should have been given if any (They need a character to make a scientific breakthrough that all engineers in Starfleet have been trying to do for decades, and they give it to the pilot? Not Torres?!), and finished it in a way that required them to ignore all the implications in every other episode.
Like they said "Obviously the show can't end so we need a reason they can't go warp 10 again. Alright, pick a horrible fate out of the hat! Super-speed evolution! Let's go with it."
The problem with Threshold is not the ridiculousness level, as plenty of other better episodes have an equal or greater ridiculousness level. The problem is it's just poorly plotted. They took the most predictable Voyager concept of "Hey we have a way to get home!!!...nevermind" and went the dumbest direction at every story juncture. Then they did it in a way that gave Tom Paris too many special skills that frankly other characters should have been given if any (They need a character to make a scientific breakthrough that all engineers in Starfleet have been trying to do for decades, and they give it to the pilot? Not Torres?!), and finished it in a way that required them to ignore all the implications in every other episode.