You're going to burn an option year this season anyway just as with Camargo and Kazmar - the Brewers saw to that when they started the season with him on their MLB roster. On what planet are either of the two of those guys a better option to help out as bench pieces?
Arcia has 4.047 years of service time. You're not saving an option by having him spend all this time in Gwinnett, but at some point you'll get that extra year of control back. If they're bringing Camargo back up the day after Arcia hit 3 bombs, there's bound to be a certain date they're leaving him down to meet. With Camargo on the roster you still have to have Adrianza as your emergency SS in case something happens to Dansby - that's not a concern if Arcia's on the bench.