Yes, but I still don't see it. VED might be one of the reasons why certain cars are losing value, but it's not a good reason. Let's say you buy a nearly new Focus for say £8k. It's going to depreciate at least another £2k in the first year you own it. An extra £100p/a on your VED is still a very minor extra expense.
At the £1-2k end of the market it becomes much more of a consideration, I agree- but there aren't that many post-2001 cars on the market for <£2k- and those that are will mainly be cheap little cars with small engines anyway.