You are referring to a service, a digital good and a product in the same frame, while not even products are behaving the same parameters you explained. In general you appear to be correct, but again we can never know the future...
Agreed, I'm not trying to present this as fact. I just look at comparisons of things that have some things in common, others have compared BTC to USD, Gold, PayPal. It is just fun to play with the what if. I think enough reference points kinda build a picture around the idea. Enough of these relations should allow us to have some idea of the constraints and possible logical conclusions. Some of my ideas on bitcoin are related to induction of what could happen and also trying to use deductions. While none of this is really based in reality, it not entirely out of the question either.