That's not true. The price of HDTVs have steadily declined over the years while advanced technologies have been added. Phone companies are taking advantage of consumers. There is nothing ground breaking in iPhone 7 than non-geek users can't do without. Apple will keep introducing new meaningless and useless technologies because they have consumers addicted to buying the latest Apple phone as if it was the newest revised edition of the Bible.
You're talking about products... I was talking about services. Sorry for the confusion.
The price of Netflix has gone from $8 a month to $10 a month. Hulu is more expensive too. And you're probably paying more for home internet service than you did 10 years ago as well.
Services don't usually get cheaper over time.
So why would you expect cellular service to get cheaper?