It's tough because no company can be in the position to predict the future. With the information provided and research done, they felt the upgrade was doable and they marketed it. If it turns out to not be possible, pointing the finger at any particular group wouldn't be accurate. They at least deserve credit for attempting it and I am confident laptop video upgrades will be common soon, just the transition to PCI-X is one of a few things making it hard right now.
If everyone will remember the post I made the end of last year regarding why Sager wasn't choosing this path and the benefits of staying with a fixed GPU:
http://notebookforums.com/showthread.php?t=10053
There was no way to know and I was only trying to show the other side of it.
It's very reassuring they're addressing the issue up front and keeping people informed.