This, again, is part of a larger picture which shows almost all Christian faith families -- the reformed-evangelicals, the "mainstream, Protestants," the Pentecostals and even the non-denom Bible churches --- losing members, while atheists-agnostics-and "nones" are growing faster than any religious faith in the U.S.
(LDS and Muslims are probably exceptions to this.)
I don't see any reason for any Chritian to rejoice in this state of affairs. We are all, no matter what our label, facing the defection of the younger generation from Christ, and the rapid increase of a secularized America which is simultaneously ignorant about, and hostile towards, the Christian faith.
I have no ides why you would rejoice in news of people leaving Christian churches, since most of them are not just going across the street to another church: they're going into unbelief and the loss of their life in Christ.
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(And we will try our very best not to hold this other news story [picture and link below] against our Baptist brothers and sisters also!)
"Obama attends Easter services at personally important Baptist church"