Many New Cars Have No Spare Tires

I was a bit concerned when I got my 06 charger SRT and it didn't have a spare. So I bought an Autobahn tire plug kit to add to the air pump and tire goo that the car came with. After 11 years as a daily driver and 120k miles in Memphis and Philly on some pretty lousy roads, I have still never used the air pump or plug kit.

Modern tire technology is damned good and blow outs almost never happen. On the flip side my wife's 05 Grand Caravan has a spare underneath that has never been used and the rim has rusted and the tire has rotted. Do I replace it just to have a spare?