As you know, I will be filing, any day now, a lawsuit to block hundreds of unconstitutional donations by the Illinois General Assembly and Governor Pat Quinn to houses of worship, parochial schools and religious ministries located both in Illinois and even outside of Illinois. Meanwhile, Mike Newdow is awaiting a decision on his latest lawsuits challenging "In god we trust" on our money and "Under god" in the Pledge Of Allegiance And Affirmation Of Religious Belief.
When I first got involved in atheist civil rights advocacy, in 1981, there wasn't much organized opposition to state/church separation other than from American Atheists. I eventually became the National Spokesman of American Atheists, serving in that role from the mid-1980's to the mid-1990's.
The theory amongst politicians was that, if you stop American Atheists, you've stopped the movement.
Now, there are lots of atheist organizations out there, such as the Atheist Alliance International, the Secular Coalition for America and, of course, Rob Sherman Advocacy. A web search will produce the names of many other similar groups.
So, don't worry. I won't be around, forever, but when I do go away, there will be plenty of others to pick up the ball and carry it forward.