Plus you can't have it both ways. If Reverse Flash disappears because he never existed then EVERYTHING HE DID NEVER HAPPENED. Period. Which means Barry's mom never dies, all of season one never happened, etc. The show is great and the first season was near perfect but the writers really **** the bed here.
This, this, this! I just finished watching it and this is what immediately went through my head. It was a huge WTF moment. You can't just pick and choose when to apply a fundamental principle like that. I have to say, I'm not nearly as blown away as many seem to be. Right before I watched it, I noticed a headline on my FB feed (from CBR, I think) saying something like "Attention all superhero season finales - Flash just kicked your ass!". So, I was rather surprised at how much of the episode bothered me.
The notion of running fast enough to reverse a singularity seems rather silly, but honestly I couldn't even focus on it, because I was still annoyed at the time with the major hole in the "Wells never existed, but we're all still here" thing. Both of those things probably played into this, but I was also underwhelmed by the "cliff hanger" nature of the ending. Also, Eddie must truly be made of heroic stuff, because he managed to not only shoot himself in the heart, but then carry on an entire conversation. As for Wells, they've gone to lengths explaining how his powers only work sporadically and even then, only after he's been charging himself with the special battery in his wheelchair: yet, he lost the wheelchair and then was even locked up in a cell and somehow still had the speed to kick Barry's ass. Right.
Or, how about this: Wells = Evil Bad Guy. Evil Bad Guy doesn't belong in this time and is trying to go home. Evil Bad Guy will likely try to kill many people if he stays in our time. Remind me again, why are we trying to stop Wells from going home? And an even better question, when we discovered that Wells' time machine will not survive the trip if built the way he designed it, why the **** are we bringing it to his attention and trying to fix it?!?
Perhaps the thing that bothered me the most, though, was the simple fact that Barry actually went through with this plan. To put your desire above the wants and needs of every single other being on the planet is selfishness of an epicly douche-nozzle level. So far removed from "heroic" that it actually is, in fact, what we've seen various super-villains do. Hell, it's what Eobard Thrawn did. I fully expected Caitlin and Ronnie's wedding to be the moment when Barry realized this, given how happy they were and (by all rights and reason, at least) they likely would never even meet if he changed history.
Overall, I thought this show had a great first season, which is why I'm so disappointed right now.