Although I would love to see over 200 Superchargers in North America by the end of 2014, it just does not look like it's going to happen...
We will be lucky to have 100 by the end of June. That leaves another 100 to do in the six months, July to December. That is a rate of about 17 a month! Even though there have been claims, and occasional reality of 3-week construction cycles, a 1-month construction time is probably more realistic,
perhaps a little optimistic. That means to meet the 200 goal, there should be 17 Superchargers under construction, and more than that in the permitting process at any one time.
Looking at
Supercharger.info, there are currently 7 Superchargers under construction and 11 in the permitting process. That is about half of what's needed. Either Tesla has to step up the pace, or it looks more like 150 North American Superchargers by the end of 2014.