I realized this a couple of days ago when we were in a rush to be somewhere and thought to just go for fastfood drive-thru to eat. Asked my wife what she liked and she said not a burger. Every fastfood drive-thru I could think of was a burger/sandwich except for taco bell.
For me it's all the snack combinations coming out, like cool ranch Lay's. Between that and all the remakes and reboots it's like consumer culture is eating itself.