Millennials are killing chains like Buffalo Wild Wings and Applebee's (BWLD)

Casual dining is in danger — and millennials are to blame. 
Brands such as TGI Fridays, Ruby Tuesday, and Applebee's have faced sales slumps and dozens of restaurant closures, as casual dining chains have struggled to attract customers and grow sales. 
"Casual-dining restaurants face a uniquely challenging market today," Buffalo Wild Wings CEO Sally Smith recently wrote in a letter to shareholders.
According to Smith, these sit-down restaurants' struggles can blamed on