For the record, this is a very old idea, and was actually "attempted" at one point:
http://forums.sjgames.com/showthread...ghlight=online
http://forums.sjgames.com/showthread...ghlight=online
http://forums.sjgames.com/showthread...ghlight=online
Also for the record, SJ has said (to paraphrase) that he would likely get behind a computer game except that all the prior attempts were half-cocked or never went anywhere. If someone were to present a complete, solid product, he might support it (though after the fact).