Having looked at Buick's lineup I think they perhaps are more doomed than Pontiac. Saturn is getting a couple of cool new products in the Aura and Sky. What's Buick got? They have the LaCrosse which is still derived from the old GM10 platform that dates from the late 80s, the Lucerne, and the LeSabre (which I'm pretty sure is about to be replaced with the Lucerne). That's about it. Then there's a rebadged version of GM's neverendingly rebadged minivan, a rebadged version of GM's neverendingly rebadged midsize SUV, and the Rendezvous which is a less-ugly version of the Pontiac Aztek.

So far the only people I can tell that are keeping the Buick brand alive are old people in the midwest. I see tons of Buicks around here in Madison, more than I ever see back home in the DC area. To quote Car & Driver:

Like many GM products, the LaCrosse is far better than the cars it replaces. But the environment keeps changing as the competition advances. Buick took a safe and conservative approach with the LaCrosse, and the result is not a class-leading must-have. Priced from the low 20s to the mid-30s, aside from the front drive that might appeal to a few Snowbelt sufferers, the LaCrosse doesn't have the value or appeal of the 300. GM product czar Bob Lutz probably won't be fielding any calls from Snoop Dogg trying to "get that brand-new LaCrosse up outta you," and that's probably the way Buick loyalists want it. But who is going to buy a LaCrosse when those Buick owners are gone? That trendsetter Tiger Woods?

Even the relatively conservative Ford Five Hundred is managing to get some import intenders to take a look at it. Buick is staying very much in making Buicks, and I think Buick is a brand that has limited appeal. Maybe the Buick ideal is something that can be exported to more people than right now, but not with something that is both a really good car and a really good Buick. But I don't see anything in the future pipeline to indicate otherwise.