Scans_Daily

His insertion in any future game would be past the role for which he exists and be stale and non-complex.

I very strongly disagree. Just because Wheatley had one role in Portal 2, it doesn't mean that he couldn't outgrow that role in a sequel.

GLaDOS was a shallow, if hilarious, villain in Portal. But in Portal 2 she becomes MUCH more complex, and develops a sort of love-hate relationship with Chell, to the point where "you are too hard to kill" sounds like a blatant excuse to justify the fact that GLaDOS simply didn't want to harm Chell anymore (seriously, how hard would it have been for GLaDOS to simply have her turrets shoot at Chell when she was unarmed and trapped in the elevator? Instead, GLaDOS has them sing "my dear beautiful child, I respect you, goodbye," brings Chell back to the surface, and even gives her back the original CC. It's obvious that at least some part of her has grown to care for Chell).

but I'm not seeing any sequel coming in the next years

Me neither. But TF2 was in development for over 10 years, so I do hope think that we might get a Portal 3 eventually :)

Of course, all of this also comes from my viewpoint of Portal 2 as plainly a feminist mother-daughter story, with the only male presences of Cave Johson, Wheatley and Ratman as secondary characters in that story. So I see no point in exploring it further with those characters which were very secondary to the underlying story dynamic.

I agree that the story of Portal 2 was about the GLaDOS-Chell relationship, which is why I LOVE its overall ending to bits. As far as GLaDOS and Chell are concerned, the ending of the game was sheer perfection in every way.

However, the fact that Rattmann and Wheatley were secondary characters in the story of one game doesn't mean that they couldn't have a more important role in the story of its sequel. Similarly, the fact that the story of one game is about a feminist mother-daughter relationship doesn't mean that the story of its sequel couldn't have a different theme.