I think Valve did a really good job at wrapping things up in a nice and sweet package. The end to Portal 2 was amazing!I don't think they CAN make a Portal 3.
Everything was wrapped up in Portal 2. There's nothing left for Portal 3.
I've seen plenty of references to Black Mesa in Portal 1, and more than just the ending.(though, they're the same universe anyway, aren't they?)
From what I understand, both are researching portal technology, Aperture just reached the Borealis and the technology that was onboard before Black Mesa/Freeman did.I've seen plenty of references to Black Mesa in Portal 1, and more than just the ending.
Surely, they're in the same universe, or possibly even the same world. It's entirely possible, since Aperture Science is mostly located underground.