Taste is subjective, the spike in old bikes soring due to collecability and being vintage you mentioned are bikes that are 30 years older than the 1st Gen, the rocket is not an iconic well known machine and the generations buying bikes are probably the only thing that is going to drive any prices up.
Here is a great video explaining but imo the 1st gens will stay around 5 grand max with respect to inflation for a long time.
I'm not crystal ball but I do know trends in motorcycles enough to know that the rocket is enough of a niche thing that it may never have any real collectable value other than to the enthusiastic buyer.