Maybe......although I was at a Nissan dealers on Saturday. They had a 54 plate GT, azure with 24k miles which was on the forecourt at £12k. That came down to £11.5k within about 2 mins. I think if I handed them my switch card they'd have done it for £11k. And that's at a Nissan dealer.
I'd imagine that when the realisation that a new one can be had for circa £20k, the used market will start to reflect this. I priced up several over the weekend and at the moment it's now cheaper to get into a new one on a decent PCP arrangement than it is to buy a cheap used one on standard finance. Scary!
But £11k isn't £10k
I think you'll find the reduction of the cost of new zeds will only affect zeds about two years old or younger. the older zeds e.g 53/54 will continue to hang around at the £10-£12k mark. Its 07 onwards cars that were trading around £17k-£20k+ that will feel the initial hit as who would buy an 07 when you can get a 09 for around £19k..........