What does the last scene in A Streetcar Named Desire suggest?

In all honesty, the last scene demonstrates some fairly
unsettling truths about human beings.  Blanche is shown to be tattered emotionally,
depending "on the kindness of strangers" and going off to her own doom, taking long
strides in the process.  The poker game between the guys goes on, and while there is a
bit of an outrage, no one says or does anything.  Stella recognizes that committing her
sister to institutionalization might have been a mistake, but she is cooed back into
submission through Stanley, who is the "winner," but if he is the force of victory,
humanity's redemption is in trouble.  The reality brought out in the last scene reminds
the viewer/ reader of the lack of totality or overall redemption within human
consciousness.  It is Williams' stinging coldness in the last scene that forces the
belief that if "life continues," it might do so at the cost of specific individuals. 
There is an ending, not a good or bad one, but rather a cold one, reflecting what
Williams might see as the root of all human interaction.