They need to get their act together with the main brand if they're going to do that, which they won't.
The story telling on nxt is levels above raw or smackdown...and it's not like it's amazing, it just, actually exists.
Apart from Reigns I can't even work out who the heels or faces are on the main shows, or who is supposedly feuding with who. On nxt basically every match at takeover had a decent feud or backstory to it. Summerslam...I dunno. Edge Vs Rollins sort of had a story, in that they lazily tacked one on based on something that happened years ago, and even then there was no reason to care who won.