I think the problem with freicoin is it takes too much effort to explain to laymen. This means it wont be adopted easily.

Most people wont know what demurrage is

Most people dont like the idea of paying fees

The notion of demurrage discourages early adopters

Most people wont like trusting a "foundation" who gets a cut of everything (many organisations start out with good intentions)



Considering all of that, why not just go with the bitcoin model with a maximum number of blocks so high that would take millenia to reach the end point of. That way you would have your inflation component (printing of new coins) fixed, and wouldnt need to call it a fee or confuse laymen with terms like demurrage.