Apparently, many families felt similarly about her character -- that she's a positive role model to have in addition to (not, IMO, in lieu of) the other Disney princesses. Disney changing that seems like a "missed the point" sort of issue -- I definitely had a "what the heck?" moment when I saw the Merida dolls that didn't have a bow, for example. However, I also see the merits of an older Merida as a princess figure. Perhaps she finds she likes dress-up more, in addition to wild rides with mud and bow, as she becomes a teen.
The only Princess that comes close to Merida in this regard is probably the one I grew up with: Mulan. But Mulan is portrayed as being so beautiful that it almost doesn't matter that she's clumsy and headstrong because her beauty alone would carry her a far way. To a very plain (then) girl this was still a pretty awful message and instead I resorted to reading books that didn't tell me that I had to fit a specific mold I wanted no part of. Now I get to watch Merida and watch my friends' kids watch Merida and I'm glad they have a mainstream choice that tells them it's okay not to be one of the other ten Princesses.
There is nothing wrong with giving kids a choice. If anything, changing Merida to fit the usual Princess mold is pushing girls to believe that "girly girl" is the norm and tomboys are unacceptable.
You should try reading the article when you claim you read something.
You are for this?
I read the article as saying that it is immoral to portray girly girls. Instead we must always show tomboys, to give girls the right role models.
I am against that.