While true, it does depend on the effort to get required item. Not every BS has CAP VIII because for instance, unless I spent a much more significant amount of my life than I am on FL, I will never have the 800 million credits or so. I'll settle for a Cap IV cruiser and probably never get past it.
Likewise for cloaks, jump drives and bases. They are so resource intensive, that no, not everyone will have them.
I may be wrong, but it seemed like in the OP these upgrades were to be akin to cloaks and jump drives in how they are obtained, and also in pricing (e.g. an end-game credit sink). So no, definitely not everyone would eventually obtain them.
Disco is awesome because there are so many (roughly at least) parallel options, like picking a different VHF. It will fly different, and feel different, but isn't necessarily any better or worse than that VHF over there. If add-ons were implemented, I'd like to see them under this principle.