This article asks a great question:
If Trump continues tacking towards the economic center, how will Clinton react to distinguish herself? Especially if she’s trying to please both her party’s urban professional vote, while trying to woo anti-Trump Republican voters at the same time?
Trump has been all over the place with his positions in the primaries and hasn’t been afraid to contradict himself. If he beats Clinton back to the center where does she go to differentiate her policy from his?
Of course she could just forget all of that and run on the “I’m not Trump” platform.