I feel so stupid - I made a batch of color flow and FORGOT the meringue powder - then iced thirty cookies, all the while wondering what was wrong with that sugar - duh! Should I throw them away and start over or will it dry?
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Thanks for all the suggestions, I guess this was too dumb a mistake to even take any time for. I am scraping the icing off.
I just saw this post. I am always making silly mistakes when I am distracted. Allot of work to have gone to waste. I don't know how well the RI would have hardened without the stabilizing agent, when I make sweet rolls I only mix icing sugar and milk and it never gets really hard.
Maybe for the next time this will help,,,,,http://sweetopia.net/2012/10/c...wder-in-royal-icing/
Thank is how we learn! Good luck with the next batch. T
Wish I had a good answer for you. I even tried to Google it because it could happen to anyone but there wasn't an answer ... I guess, when in doubt ... sorry I'm not helpful! Did you end up scraping each cookie?
I'm assuming you basically made a "glaze" rather than royal icing. It should dry and harden just fine, but won't have the same sheen and look as RI. If I were selling them, I'd start over. If it were for family or friends I'd leave it 
It's the protein in the egg whites in the meringue powder that causes the icing to set quickly and hard. Without it, your icing will be confectioners' icing (essentially, liquid and sugar). It will eventually dry, as others said, but it will take longer and you could experience more bleeding problems. I'd say wait and see what happens if you have the luxury of time. "Mistakes" are often the greatest learning experiences.
