I actually really like the episode. I mean, it was obvious that Twilight was destined for great things. Remember the flashback in Cutie Mark Chronicles? Celestia's NEVER seen raw talent like Twilight's. She took this little pony that didn't even have a cutie mark and made Twilight her PERSONAL PROTOGE. That's kinda rare.
And...yes, 'twas a little rushed, I agree. I wanted it to be an hour-long special. But....the writers'll figure it out. They made the episode so great in the first place.
Not to mention that someone on the writing staff tweeted that this is pretty much a three-parter(but we'll have to wait for parts 2&3) so...who knows. Maybe Twilicorn won't survive. Maybe it will. Don't get your hooves in a twist in the meantime.