Well Metal Gear Solid V did this, did't it? so if tha game wasn't boring even with the obligatory chopper flights(due to being a huge open game) I don't think Kratos game will be boring, specially since you won't be watching Kratos sit on a helicopter.
I don't really love past GoW games, I did enjoy them but I prefer other other games in the genere, and I really find Kratos to be really lame, but this is the first time I'm hyped for a GoW game with all this changes