That sounds good until you consider that some could be using those rules to manipulate and abuse others, especially women. This makes me ambivalent about it (though not paranoid, like so many of "OMG Sharia comin' to get us" crowd).
For example, in the US we have the Amish community which has its own rules based on religion and maintains a certain separation from the rest of the country. But, they give their children a chance to experience and hopefully learn something about what they would be missing if they decide to commit to that separation and the Amish life as adults.
If, as the article implies (there seemed to be a lot of barely attributed anecdotes in it), young girls are being forced/manipulated into marriage and wives are being pressured to stay with abusers, that would be a good reason to give these practices a serious look and try to figure out a way to address them as a serious problem.
But why is this article being framed as if it has to do with Sharia law? The article itself makes clear that in large part the problem is that mediators aren't really following any law besides perhaps "Muslim men are to be in control of the lives of their wives and daughters."