There is a fascinating post on my dash about “where we think Blaine’s plans are going post 5.06” but I’m too lazy to try and find it again, so here is my list of storylines that I think could happen with Blaine, based on nothing other than my knowledge of Glee.
1. Blaine gets into NYADA. Blaine hates NYADA. He has his own personal Cassandra July (whatever he cheered for Sue Sylvester he can deal with antagonistic authority figures) but the thing that bothers Blaine the most is the thing that has always bothered Blaine the most: nobody genuinely likes him. Everyone is his competition, and outside of his friends outside of classes (Kurt, Rachel, Sam, ect.) he has zero friends, and Blaine cannot stand not being liked.
In fact, Glee could use this for some great stunt casting they love to do. “Taylor Swift plays Brianna, Blaine’s new BFF, but does she have more sinister motives other than friendship?”
(And she does. She’s totally just using Blaine for popularity/influence at NYADA, and the she doesn’t even like Blaine or his bowties, and how would Blaine even deal with that???)
2. Blaine gets in NYADA, but success comes to him too quickly. Like, even quicker than Rachel with Funny Girl, and it’s far more widespread mainstream success, too. Cue Blaine trying to navigate his friendships and relationships with people now that he’s Suddenly Famous. Taking the Ace trope Up to Eleven, if you will.
3. Blaine gets into NYADA, but before he graduates high school (possibly at Nationals in LA) he is given an amazing opportunity in Los Angeles, one he’d be stupid to turn down, so now we see if Kurt is willing to pick up and move his life around Blaine like Blaine was willing to do for Kurt.
Either way, I don’t think this is going to be as cut-and-dry as we think. There’s no story in “oh well Blaine gets into NYADA that’s nice” like the show is hinting at right now.