It's going to be hard trying to be as objective as possible....
:As an RPG fan, you will probably be very upset with how little long-term options there are, and the lack of consequence for them.:
Maybe you should say "might" instead of "probably".
It's a very interesting concept. But my problem is that card games have a lot of limitations. I don't want to stray too far away from your original concept, but wouldn't a board game be better? Maybe something on the lines of D&D?