I listened to the show last night, just after it came out. In the letters section, I believe the gang talked about a Gamepad revision to make it more attractive, allow for purchase as a second Gamepad, etc. As far as I know, Japan is the only region where you can buy a second Gamepad and that if it were an option in the US and other regions, it would sell for the equivalent for $130-150. Unless the theoretical revised Gamepad retails for $75 or below (and $75 is still somewhat nuts), the idea of a second Gamepad is dead to almost everyone anyway.
I just don't see why the Gamepad costs so much. Are they just trying to make back R&D money? Has the price of LCD screens gone up recently? There just seems to be no reason for it to be as expensive as it is. It's basically a controller with a screen on it that can wirelessly send/receive data (same as the WiiMote, only it needs higher bandwidth). No processing takes place on the gamepad, so the expense of a CPU/GPU, etc. doesn't factor in.
I realize that the past 10 years or so has seen the console manufacturers basically double or more the price of their respective controllers for slightly better tech than the late 90's (at least the Wiimote had some excuses for higher prices), but the gamepad has gone over the rails, doubling or tripling the prices over that.
Unless they address the price issue, they can revise the Gamepad all they and the fans want. It's still going nowhere as far as proliferation is concerned.