I may be missing something, but it looks like only 2 of the top 10 young economists ranked by RePEc are doing what might be considered broadly micro research. The other 8 do either macro or trade.
Is this a sign that research in macro and trade is advancing quickly, and so is more popular? I doubt it. In fact, I suspect the opposite. Because of stagnation in these fields, good work is probably more likely to be centralized in a few researchers who dominate the citations.
Or, perhaps this is a sign of the popularity of "big" issues. Micro studies probably don't capture as much of the imagination as macro issues, especially now.
HT to MR