No. STREAMS much more powerful than current interface is.
You can emulate BSD socket interface (and ttys, and....) on the top of
STREAMS (f.e. Solaris-2.*), but the reversed task is impossible.
Only poor emulation, that is useless.
Well, there is STREAMS, and there is TLI. STREAMS is more general than
BSD sockets, but you pay an extremely high performance penalty for this
generality.
However, most System V programs don't use Streams directly, but rather
they use TLI. And it's not very hard to emulate TLI on top of BSD
sockets interface.
- Ted