At this point in programming it is not a matter of what you think would be popular out there. It is a matter of learning as much as possible. Have a little look at this thread. As I said in there: you have to crawl before you walk, and then you have to walk before you can run. I think it is great to see people wanting to do textbased games now instead of rushing into graphical gameprogramming, only to find out that it was too hard and drop the whole thing with gameprogramming.
