Was Lenny's and George's dream destroyed when Lenny killed Curley's wife or was it his death that destroyed it?

Concerning Lennie's dream in Of Mice and
Men, deciding exactly at what point it's destroyed is a little like splitting
hairs, as they say.  Realistically, Lennie and George never had a chance of fulfilling
that dream, anyway, so it was destroyed long before Lennie kills Curly's wife or
before George kills him. 

On the other hand, Lennie's dream
is an illusion within his mind, so technically, it would not be destroyed until Lennie
is destroyed, since Lennie is not enough aware of the consequences of his actions to
understand what's coming.   

George's part in the dream was
equally an illusion and virtually impossible to fulfill.  But certainly, for George, if
he really believed in the dream, his belief would have died when Lennie kills Curly's
wife.  He understands what this incident means more than Lennie
does.

Lennie's dream may continue until Lennie's death,
then, but George's dream certainly dies with Curly's wife.