Landline Phones
The only people who probably still have landlines anymore are our grandparents. Since the invention of the cellphone, the convenience of never missing a call if you leave the house outweighs the need for a phone that plugs into your wall. So long to overbearing ringtones and answering machines for good.
Checkbooks
Since the invention of online banking, the need for a checkbook has become pretty old fashioned. When was the last time you balanced a checkbook? Probably never.