FWIW, I believe (relatively speaking) the MP4-12C will carry very strong long-term residuals state'side for the very reasons that...
- there's seemingly more of a genuine & refined enthusiast client base wanting an MP4-12C over other choice ~$200k+ (USD) mid-engine exotics;
long-story-short: car-guys/petrol-heads (those in the know, as succinctly put my Jay Leno).
- there will be perhaps 1-2 MP4-12C's to every 25+ 458's, 20+ Gallardo's, 15+ R8's, etc.
- McLaren.
Only things I can see precluding such would be...
- petroleum-based fuel becomes a scarce luxury due to wars, embargoes, supply disruption (then there would be bigger concerns than one's mid-engine exotic)
- catastrophic failures/recalls of the nameplate akin to being "lemons" (don't see this happening; hopeful no rival conspiracy ever takes hold)
- manufacturer insolvency (again, don't see this happening... Ron, no risky investments!

)
No, I was more thinking of the 3 F50 Chassis #99999
