Good question. I'm afraid they won't. Only those with low miles and in mint condition will ever see a decent price in the future. The question is: How many VXs are out there with less than 30K miles on the clock?
I think there is one or two VXs (the Pearl one and the VX02) that might bring some decent bids. I don't expect anyone to pay more than $20K for a VX in the near future.

I might be wrong....but I just don't see it. Time (a very long one...) will tell.