I'm going with Shia LaBoeuf. It was kind of understood early on that he was gonna be the next Tom Hanks, which is telling cause Hanks doesn't have that much range and is generally playing an everyman type so he's pretty generic to have a crowned successor, and has a reputation as a method actor....but he's just never commanded the screen. His career survived, in terms of being a known name that has been around for decades, but i don't know why.