With all due respect, your statements are kind of discombobulated...
-The 5th Gen Z/28 is a special car, but won't be that special in the future?
Yes, it is a special car in a sense of the parts and package. I do not believe it will be a special car in the future that will command the collector car prices. Two variations of the word 'special'.
-It's somehow comparable to a B4C that has literally no special features at all (it was a Z28 in sheep's clothing - big deal...)?
You referenced rarity making the car 'special'. Just making a point that more goes in to it than just rarity.
-You don't care much for a 1969, but want one?
Correct. Not the end all be all to me, like it is to so many people. I would like the DZ car, almost exclusively for the engine. I'd prefer the 302 in a 70-73 if I had my picking.
I have no idea whether 5th Gen Z/28s will be collectible in the future, but if they are it will be for a combination of these reasons:
1. The 5th generation has been a popular generation.
Correct. The point I am making is BECAUSE it is so popular is why these cars may not be future collector pieces.
2. The Z/28 is the "most" Camaro you could get in the 5th generation.
Correct. My argument against it is, more people prefer the 2SS or 1LE or ZL1 instead, because this is a 'most' kind of car meant for people like you and I.
3. The iconic 427 (and very likely the last large-displacement N/A V8 used in a Chevy).
You could be right.
4. It was reviewed extremely well by virtually every automotive publication that got to wring one out - including 2014 Best Driver's Car.
Agreed.
5. There is far more to it than a sticker package - CCBs, DSSV dampers, functional aero package, etc. (i.e. There are significant, substantial and costly upgrades over the standard Camaro).
Yes, I think me using the word special is where the confusion is maybe. I understand the upgrades, I work around the cars everyday 
. Very few have the research into these cars that I have. We both agree the Zs are 'special' but will they be highly sought after collector gems such as the, say, old COPO cars? That is where I say no.
6. Fewer than 1800 built.
Your screen name is 1970 Judge (I assume you're referencing a GTO and not that you are a 46 year old magistrate) - what characteristic does the 1970 Judge have that makes it desirable and collectible that a 5th Gen Z/28 does not/will not have in 30-40 years?