Oh, I saw that yesterday, and I agree with Remnick -- very sad.
Unlike other journalist-fabricationists like Stephen Glass or Janet Cook or Jayson Blair, Jonah Lehrer was really talented at writing that doesn't involve making stuff up. But he must have been super busy -- blogs, articles, bestselling books -- and maybe could not resist the temptation to cut corners.
Resigning in disgrace from the New Yorker is so unheard of I would imagine it would seriously threaten any future career. Plus, the publisher has stopped shipping his book and has pulled the electronic version.
It had sold 200,000 copies so far.