RPG's are a notorious genre - possibly the most notorious - for being deceptive about how difficult they are to code. They seem simple looking from the outside, but when you actually try to code one, even a simple one, it turns out to be a monumental(ly complex) task with tons of interconnected systems that all have to play nice together.
RPGs are probably the second hardest genre to make, second only to MMOs!
I'm not sure from a development standpoint that there even is such a thing as a simple RPG. And while it could be done, trust me, I can tell you from experience of having tried to make a 'simple' RPG (it turned out to be not-so-simple) without families - it's possible, but you really don't want to! Had I known how to use families properly from the start, it would have saved me literally an entire year of development time! It's worth waiting for families to be implemented, since they're in the works already.