Some disagreement on this but in my mind I'm certain the value will increase.

The best illustration I can make for comparison is the Chrysler TC. Like the Crossfire the TC was also a collaboration project with a European maker, in that case Maserati. Not particularly well recieved the TC languished as a bit of a freak and impossible to get parts for (unlike the Crossfire which can use SLK 320 parts).

Now look at values. 7 years ago a running TC could be had for around $3000. Today a running TC will cost between $6-7k very nearly the same going rate as a Crossfire. What changed? Nothing, other than the car surpassed 25 years and has some Mopar historical value. Absolutely no reason to think Crossfire won't increase as well.