The National Identity Card, or CIN is a sesame that you will have to use much more often than in your country of origin. And even as an expatriate, you will hold a CIN, as it is granted to Moroccan non-residents, and takes the place of a residence permit.
The point on the different residence permits in Morocco, there are three: registration, residence and circulation document for minors.
Regarding taking Moroccan citizenship, the real question is not “can I” but “should I”, and the answer to both is usually “no”. Let’s look into details
Once your situation is cleared, the fine paid and you left Morocco, you are not blacklisted and you can come back without any problem. In order to make a good assessment of your risks if you stay in Morocco after the August deadline, it’s necessary to understand how is the procedure done, and what it implies for your future in Morocco.
Some people get some information from an unnamed Moroccan official, that all foreigners who are actually in Morocco without a residency permit should leave the country the 10th of August the latest, or they would be fined.
Obtaining Moroccan nationality is complicated and almost impossible, except in certain special cases. It is even more difficult to “lose” Moroccan nationality, even voluntarily. An obstacle course with no real advantages at the end.