No, it is not.

The point is you wont get anywhere trying to convince them that their product isn't very good at being an X, when they have no intention of it ever being an X. If you want them to make a good X, you have to figure out how to convince them that they should be selling an X.

Convincing them that the NIT is a web device, and other web devices (PepperPad, Foleo, etc.) all failed, so they better make it a better PDA ... might only convince them to cancel the NIT, because you've just convinced them that web devices fail, without also convincing them that they should be in the PDA business.

The point is: you have to learn how to talk to your target audience if you ever hope to get them to do what you want.