Considering he was starting games for van Gaal, I highly doubt we want to get rid, especially if van Gaal will be gone in a couple of years and the club looks at the bigger picture, which we seem to do with Memphis and Martial. Like I said we most likely bring someone else on top of Martial in, if we loan out Januzaj. I'd guess someone who's currently better like Griezmann or Fekir. Otherwise it wouldn't make sense, since we can give him a lot of time ourselves. Still, Dortmund would be a good loan move for all parties.