I have a Bigshot and a Silhouette Cameo. I do use my Cameo alot when I need something in a hurry or I don't have a die for it. Even though it does the cutting I still determine the cut, and often create or alter designs for my own use.
I can't see manual die cutters going away though. They are fast and they emboss. They are also much more portable.
"If a person who indulges in gluttony is a glutton, and a person who commits a felony is a felon, then God is an iron.”
― Spider Robinson