I think it's good for alternative systems like Freicoin to exist because now, for the first time ever, people will have a free choice between currency theories without central planning or coercion.
What I expect to happen is that virtually everyone will reject demurrage when they are free to choose between that and a currency that gains in purchasing power over time but the best way to prove this is for the alternatives to Bitcoin to be as credible as possible.
I'm do not think the monetary theories underlying Bitcoin will lose in a free marketplace of ideas, but if it turns out I'm wrong at least I'll be wrong because something even better than Bitcoin showed up. From that standpoint it's a win-win outcome.