It could happen but if you look at the current stats for NL SS it's a bit of a longshot. Figure 1 vote and 2 coach picks. The problem is the vote will either Tulo, Reyes, or Starlin Castro. And right now Furcal and Infante have better stats. Odds go way, way up if somehow Furcal gets voted in. And still Desmond could pass either of these guys. Or they could get injured. Or there could be 4 SS but I doubt it. Hanley or Tulo could easily come alive and fly right by Ian too. But he's definitely got a shot as of now.
http://sports.yahoo.com/mlb/stats/byposition (filter for NL, SS and qualified leaders)