What kind of post-apocalyptic city do you live in that doesn't have radio stations with music, or record stores (albeit, they don't sell records anymore)? Maybe things are different in Canada, but none of the things you are saying are true about the cities I am familiar with.
1. Stores now can make money from internet presence and this helps keep the bricks-and-mortar location profitable.
2. Blockbuster... well, I'll give you that one. Netflix has done them in. Also illegal downloads. Also new releases cost WAY less than they used to (esp when you factor in inflation). So I'd say buying movies is a cost-effective alternative to renting.
3. Broadcast TV is very location-dependant. Cable TV has always been superior. As for better shows, I think nostalgia has confused you. Yes, SOME shows were better then than SOME now, but on average, there's a better selection now with some much better productions.
4. Radio: still alive in many cities.
5. Record stores: There are too many to count in my city.
6. Computer parts: My friends and I never buy online. Better to go into the store and negotiate a discount with the people there. These stores are always full of customers. They are everywhere and expanding and opening new locations. So I don't think the internet has hurt them.
Maybe you're just living in the wrong city? :)