It's too early to tell...........
1. Is the market for used VWs already crashing? VW has suspended sales of all used and new TDI models until the company develops a fix, so it's unlikely you will be able to purchase one through a dealer any time soon. I'd hesitate to buy one from a private owner at this juncture, since the new owner would then face needing to deal with installing whatever fix VW develops, and the potential for decreased performance/fuel efficiency/cargo capacity due to the fix.
2. Is it expected to be limited to diesels or is there likely spillover to gas models? It's currently limited to diesel engines, specifically 4-cyclinder, 2 liter engines produced in model years 2009-2015. However, you can bet VW is going to face scrutiny regarding emissions estimates in gasoline models.
3. Again, I'd hold off on visions of a cheap Sportwagon at this time - also, VW diesels are not necessarily a mustachian choice anyway, due to the expenses associated with maintenance. Also, if you're looking for a tow vehicle, you'll want to hold off to see how the 'fix' affects performance.