Ah, not this argument again.
Sure an EVO can be really fast like an exotic. Can it ever be really desirable or collectible like one though?
I don't think any modern car can be truly collectible, unless it's a limited production supercar (think Enzo, McLaren F1) or particular race cars.
FWIW (and it's not worth much!), I even seriously doubt the potential collectibility of limited edition production cars from Ferrari or Lamborghini (i.e. CS, Scuderia, LP-670SV etc).
An F355/360/F430/458/Gallardo/Murcielago/etc certainly won't ever be collectible, IMHO. Far too many of them are built; and they're perceived as regular production models to be replaced in 5 years time by the next new thing. They're not homologation specials or connected in any way to motorsport.
Desirability is, of course, subjective. Depends on the purpose. Generally speaking, an Evo cannot ever be aspirational in the same sense as an exotic is, but if you want to win or be competitive in tarmac rally/production car racing/[insert motorsport category], then an appropriately prepared Evo will be highly desirable! For me, they're very desirable (more so than a regular production exotic) because of that real connection to motorsport (and their success in pretty much all genres of competition). An exotic must have a direct connection to motorsport for it to be truly desirable to me (F355/360/F430 Challenge, etc). Homologation/motorsport derived cars have always been my favourite kind of cars, exotic badge or not. Unfortunately for me, they're also loved by lots of other car nuts, hence the relatively astronomical prices these cars sometimes reach when they obtain classic status (especially when such cars are the ticket of entry to certain highly popular motorsport recreation events in places such as Europe).
Without meaning to state the obvious, what could be deemed collectible in the future, cannot always be discerned by reference to past or current trends. The cars that are the most collectible today are those that either raced (comp Ferraris, Jags, Fords, Mercs and Porsches from the 50s and 60s; pre-war Bentleys, Alfas, Bugattis, Mercs, Delahaye etc), and/or were homologated to permit a model to race (certain road-going and comp models of marques described above), and/or were ground-breaking, iconic and/or trend-setting road cars (Miura, Gullwing Merc), or were impossibly expensive and built in single or double digit numbers when new (certain Duesenbergs and Bugattis, probably best espoused by the Type 41) and have thus been collectible since new.
Off the top of my head, there aren't too many modern cars built today that fall into one or more of these categories. Coupled with the fact that so many cars are built of any model in general (save for the Super Ferraris or the next top of the line McLaren (the F1 successor not 458 competitor), I can't see very much that is modern being collectible at all. And anything brand new that is likely to be collectible, is likely to be built in single or double digits only and will thus only be affordable to someone who also has a Gulfstream GV and their own island anyway.