I think the net effect of the Baby Boomers on the world has been negative.
I think that the worst damage to America and to the world was that of the, say 60 year period, before 1980, and that the years since roughly 1980 have been less destructive, in other words, once the boomers reached adulthood, they have proven to be better, and have moved America to the right of where it was, and that has to be done inside of the box that the previous generations created with their mass replacement of the American electorate with foreign born democrats and their offspring.
Boomers only got the reigns of power in the late 1980s and in the 90s, for instance the first presidential election that all boomer born voters could vote in, was in 1984.
Boomers are much younger and recently adults, than people think.