There continues to be a lot of friction right now between Stephanie McMahon/Triple H and Shane McMahon behind-the-scenes. Vince McMahon is loving it because he’s “hell bent” on creating as much real (and imagined) competition between Raw and Smackdown as possible. Stephanie isn’t happy that she was told Shane was only coming back for Wrestlemania 32 and now it’s SummerSlam and he’s still around.
Vince doesn’t necessarily have long term plans for Shane, but he's enjoyed the sibling rivalry to keep Stephanie on her toes, not to mention wanting to feel like when WWE moves on from Shane, it isn’t because of Stephanie’s complaints or her getting her way.
In meetings when preliminary ideas for Wrestlemania 33 have been thrown around, Vince has brought up Shane’s name, which indicates he isn’t opposed to keeping him around a while longer. One match Vince brought up as an idea for Wrestlemania was Triple H vs. Shane McMahon in a “loser leaves WWE” type situation but Hunter is 100% opposed to wrestling Shane at Wrestlemania.
But with Vince, showing you’re opposed to something can often just make him want it more.