I think the curvey and rounded lines of the 90s and early 2000s will continue to age very quickly.
Cars like mx-5s, supras, rx7s with the flowing body shape will age fast and not become collectible, whereas more gutsy, angular, and boxy edged cars like Skyline GTR will hold their value, maybe increase.
240z will increase in status as people catch on to how good they look. And as more people irreversibly molest them, eventually every Zed will have flares, dish, and spoilers, and the price will go through the roof!
Thats my opinion.