I believe that if the roles are reversed it would be even more awesome. I love both games but imagine future mass effect games, where you play as different protagonists, witnessing different types of adventures, exploring the space in different time periods and so on. And on the other hand imagine Dragon Age game, with Ezio like approach. For the future next gen Dragon AGe and Mass Effect games i would love to be able to play like that. Role reversal will freshen up the gameplay,story and.....everything possible.
Imagine if you 3 DA games,where you begin as a teenager and finish as old man, who travelled all the Thedas, witnessing all ithat is there to be seen.
Now imagine Mass Effect next gen game, where every game you play as different species, or at least different character covering slightly different time period, or at least visiting different locations doing variety of things, like one protagonist being turian mercenary or some krogan grunt in the heat of war between krogans and some new race or sth. Or some drell merchant who is caught between two factions who battle for control on his own planet, with all the races and backstory of the series-sky is the limit, and locking the protagonist is sth that can be altered in the future.
Now in Dragon Age, you can see the world perfectly clear from one set of eyes, plus you will not be annoyed by - Old God baby stuff, where is morrigan, where is my warden etc....Sth similar to the witcher games, where there is single protagonist. But here in Dragon Age you could make future installements feature perfect character creation in the first game, that let you make cool character and 3 voices to choose from. And this is it.....Next games you play as that guy. More accurate complexion meter will be enough to cover the needs of tweaking the original face of your character.