The idea I had was extending ansi codes to contain specific instructions for NES graphics hardware, along with a special NES rom that could decode them from say, some audio signal via the microphone port, or controller port 2 keys, or whatever input is most convenient.
Such an ansi protocol extension would include things like sprite graphics, tile graphics, sprite positions, in addition to the normal character mode telnet stuff that maps naturally to the NES's tile based background graphics.
That would be pretty neat.
It would let you put a modem attachment on an NES and dial into a server to play games remotely. Such games could even be multiplayer by nature, with a centralised server infrastructure kind of thing.
You can steal it now if you want. I'm not likely to act on it any time soon.