I'm someone who was very active making flash games from 2006-2009 and who ran a 3rd party aggregation site for flash content. The people who I mostly noticed working on these projects were young and experimenting with pirated copies of flash. It was a community that popped up spontaneously. As far as I've seen, there won't be a resurgence. The next generation will have their own creative communities spontaneously explode and then disappear.