On low settings - yes they would. Except possibly Witcher 2 - not sure what's up with this game. Might be some driver issues yet because it exceeds the minimums, easily.
And you could probably run some (Skyrim for example) on medium settings.
Future games should be playable for several years, at least on low settings. But you can't upgrade a laptop graphics card like you can a desktop gaming system.
GeForce GT 550M reviewhttp://www.notebookcheck.net/NVIDIA-GeForce-GT-550M.42264.0.html