Continuing on the same theme as earlier this week:
Before Paul Graham, Lisp was dying. It really was, and let's not get all sentimental or anything; it's just common sense. A language is always either gaining or losing ground, and Lisp was losing ground all through the 1990s. Then PG came along with his "I'm not talking to you if you're over 26 years old" essays, each a giant slap in our collective face, and everyone sat up and paid attention to him in a hurry. And a TON of people started looking very seriously at Lisp.
Lisp might or might not have experienced a revival without Paul's essays, but it's moot: he showed up, and Lisp got real popular, real fast. And then he said: "Don't use it!" Sort of. I mean, that's effectively what he said, isn't it? By deciding to pre-announce Arc, he Microsofted Lisp. Killed it with vaporware. It's a great strategy when you're an evil empire. I don't think that's exactly what Paul had in mind, but let's face it: that's what happened.
(From Steve Yegge's essay, Lisp is not an acceptable Lisp.)
Or, to be totally blunt, Perl6 may be taking a loooooong time before it is finally released, but it's moving ahead at mach 6 compared to Arc.