The practical answer is at the beginning of the article. Many are, and many more could be.

But yes a strict reading of their religion opposes it. However there are secularist, reform, and various other takes on Islamic jurisprudence such as those that say the law gives broad guildlines that need to adapted to a given age.

In a practical sense I take that to mean it's OK to assimilate a number of Muslims. However if you open the floodgates of immegration things could becoem ugly.