Why do people keep insisting resale is lower? IT ISN'T!! I bought my 2013, just before Dieselgate, for market price, in Canada, for $20,000. Now? It's worth $19,000, and I've put nearly 20,000kms on it since. Resale hasn't been hit whatsoever. However, I'm tempted of getting out of my Jetta and getting into a new GTI, so I may take advantage of the buyback and $5k they give me in addition.
To the OP, I'd wait until summer, then we will know for sure what will exactly happen. Because it's possible resale may be hit when they do buybacks or the emissions fix. On the other hand, if you buy one now and don't get it fixed, it may be worth more than if it was fixed. Either way, you won't be able to take advantage of the compensation they are offering, most likely, since you bought it well after dieselgate sprouted up.