This has proved to become an interesting discussion!
Personally, I don't think that C6s will hit such a low price of £2000 and I agree with addo as it is the "last of the great tradition". However, if you look at it the other way and compare it to, what it followed on from, the CX
(I know, technically the XM but IMO the CX is the C6's successor), then the C6 could hit that price. The CX sold well but prices did drop when it was in a 'lull' and it was neither classed as a 'classic' or classed as a 'car to use', if you see what I mean. I think that the CX really made it's comeback in about 2004-2005 time when there was a demand for them, and the prices rose. The one car I remember was a 1988 CX GTi Turbo 2 that was Black with Black Leather, reg number E616 HOY. Roger and dad bought it from London and that chap went back into his house and cried for about half and hour before returning with the docs etc! This car returned £3,995 and I think that the demand for CXs as a classic car then started. The rest is history and prices have increased further to the £7000 and £8000 marks for top cars.
Reason for me rambling on about this is that this is IMO sort of related to the C6. I think that the C6 is already sort of loosely classed as a 'classic' and really is welcomed with open arms to any CCC Events and the CCC in general. There's no doubt that the C6 will become a classic - it just depends when people want to accept it as such. There's so few out there (admittedly quite a few on the How Many Left website but they certainly are rare to see on the roads! On holiday to devon, I saw more Visas and CXs on the roads than C6s! I.E - no C6s!).
As for prices at the moment, they certainly have seem to have dropped in the last year or so. Dad paid about 11K for his last May/June but it was the perfect spec for him - Black with Black Leather, 2.7 HDi V6, NO loungepack (so much better as the seats can fold down!) and 48,000 miles (now 56,000 miles). Admittedly we've had our fair share or things that need doing - the first thing was the stereo unit needed recoding but that was simple for our friends at Citroen Borocars, Peterborough. Of course, there is the
gearbox trouble that still persists but at the moment it is unique to this car and I haven't read any other C6 with it. Dad is managing with it though - any town/build up areas when warm, just flick it to manual. Let the revs build up a bit higher than the autobox would change and it's fine. Don't 100% quote me on this, but IIRC dad said there was a 'box' on the gearbox that will cost £900 to replace and if not then it's the gearbox itself which is £2000! Motorway cruising, blasting along fens roads etc is a joy though and it really is great. Dad says he'd never sell it, which for him is quite something!
Sure, it likes it's tyres, is dear to tax but at the end of the day it is what it is - a C6.
It's good to be different and IMO it's the natural follow on from the CX, so what better car for us to have?!!
As for Activas, I wouldn't be surprised if in years to come the total number of cars would fall into the 20s and 30s, possibly even lower.
What about the V6s then? According to the How Many Left website there's only 141 of them left which is much lower than our calculated total of 215 for the Activa.
Looking back at that, I appear to have typed quite a lot. 
