I'm going to have to disagree with these three points. Pontiac is indeed getting a boost in its image from the Solstice, but the Torrent and G6 coupe are already on dealer lots. The only upcoming model for Pontiac in the short term is the G6 convertible, which won't set the sales chart on fire. After that, the only cars reasonably close to production are the Solstice coupe and maybe the new Vibe. After that, it'll be the G6 refresh (2008) or RWD model (who knows).
Buick is in a similar situation. I would characterize the Lacrosse as "acceptable". Sales aren't blazing, but they're decent. The Lucerne should do well, even with the lack of a V6. The Lambda will probably do pretty well also, but after that Buick has nothing. After the Rainier goes byebye, and Buick will be left with the Lacrosse, Lucerne, Terraza, and Centieme for several years. They will eventually get a Lacrosse on Epsilon II, but that's 4 years away. A RWD model might pop up just before then, but it's still a ways off.
SAAB is just a mess. The 9-2X is back on form, selling under 100 units in September. The 9-7X sold double that, at a remarkable 132. I don't expect that figure to go up much without massive rebates. The 9-3 tanked last month; the SportCombi will help, but I don't think there are enough Saab hatchback freaks to bring sales back up to where they should be. The new 9-5 will probably bring the model back up to selling 1500 units a month or so, but that's not all that great.
Other divisions seem OK though.