The Dwarf Commoner origin has a lot going for it too, and at least it has a satisfying ending for you and your people. You become a Paragon (the highest honor), and can crown a noble who marries your sister (thus making her legally queen, not just a concubine) and who permanently increases the rights of casteless in Orzammar. (It doesn't force you to see all the progress you try to win for your people undone in several years like for Elven Wardens.)
Not to mention that of all the possible origins, becoming a Warden is more positive for a Dwarf Commoner than for any other Warden candidate. Other origins have a lot to lose, but for the Dwarf Commoner almost everything is an advantage.
I have to fight darkspawn? Cool, like the warriors and nobles who boast so much about it. Free licence to visit every corner of Orzammar and the surface without anyone kicking me out. I can meet kings and important people. Permission to steal for the greater good (not a petty criminal anymore!). And in the endgame I'll become a Paragon, the foundation of a noble house. My family will have everything they need. Ah, there's the downside of having a limited lifespan. I would be sad, if it weren't for the fact that my life expectancy was probably much, much lower as a casteless.