I've always liked the message from that speech (I even made it into an AIM away message -- so you know I took it seriously) but in essence his suicide has proved the opposite point. That for some of us, this reminder is not enough, that some of us are not meant to live in this world and can't breathe underwater. Our choices are to occasionally come up for air, let ourselves drown, or go out on our own terms.
David Foster Wallace made his choice. I wish I could say I wasn't disappointed.