It seems to me Ukraine will join long before Morocco. First, only the former is actually in Europe. Second, few EU countries would welcome the mass Moroccan immigration you would in all likelihood see. Third, Morocco is a dirt poor third world countries where much of the rural pop lives in medieval conditions (I've been there twice and can attest to this). Fourth, it is a brutal police state and a quasi-absolutist monarchy. The largest and only well-organized political party, which is formally cut off from power, is Islamist; this is probably much more democratically minded than the King. Fifth, there's the little trifle of occypying Western Sahara.

A better question might be whether Norway will join before Ukraine...

The world's northernmost desert wind.