Spec/Q - Based on my cursory reading, it seems about 10 years back there was a severe nursing shortage. In response, nursing schools ramped up enrollments and there is hardly any shortage at the moment. The current demand supply situation is expected to stay stable for at least a few years - so I wouldn't expect EB3P to pick up too much.
Long term forecasts though predict another nursing shortage just on the horizon because of Obamacare (mainly because of Medicaid expansion) and general aging of the population. Although I feel that nursing schools are going on be on top of that game this time after falling behind last time.