I can't give any educated opinion on the whole "Dawn" thing because I've not even bothered to download her.  That said, I think it would be a shame if she didn't do well, because I do like the idea behind her.

If I were to go into the business of developing a figure for use with both programs, I'm pretty sure I'd have gone the 'two versions' route as well.  Whoever created her deserves to do well because the logic behind her makes sense, makes it easy for the users, and doesn't discriminate either userbase.

To me that's 'good business', and good business deserves to do well.