We talk about this in our guild, and the person who manages to develop a third party software that recognizes chat/emails ECT... Will be very wealthy.
Naahhh... most MMOs, including RoM forbid running third party software that interact with the game so you'd be in violation of the ToS (unless it is officially sanctioned, of course).
I envinsion setting the software to translate a multitude of languages into the users chosen language. The ability to sell software to MMO's as well as global chat would be profitable. Myself I would take it to an Beta phase and sell it then retire.
Before you'd reach that point, you'd find yourself with an AI that is better than anything we can currently produce. That's where the real money is. What you could get off of MMOs would be chump change comparatively.