Imagine if these two things happened:
1) UK Introduces car scrapping scheme in the UK paying you £2k towards a new car. (link)
2) Tata introduces the Nano to the UK market for £2k or less... (link)
Obviously number 1 may or may not happen and is a dubious waste of tax payers money, and has doubtful environmental benefits etc. But imagine it happens because the UK see it as a way of "saving" the economy and / or environment etc...
Then number 2 is definitely not going to happen for a number of years, and when it does arrive here it'll probably cost around £4k to meet Euro safety laws... but even then, if 1) happened, you'd be able to buy a brand new car for £2k... seriously killing or injuring the second hand car market (and potentially the rest of the new car market)... sales of second hand cars in India is apparently down 25% already, with prices down by a similar amount.
Interesting stuff though in the what if... department
Josh