RE: Paulie
It sounds like GM is keeping Zeta under the Camaro only in the US at this point. They've yet to confirm or deny if the Commodore will be coming here as a Chevrolet to function as a new police cruiser model, but even if so, they likely won't send over a Buick model.
Truth be told, the Lucerne and DTS (both share a lot of common bits) serve a very narrow, but otherwise popular purpose: Selling cars to old people, or middle-aged people who want a big-ass car and don't care about anything else. They sell a bunch of them, for a lot of money, and they don't care.
Rumor has it that the Lucerne and DTS will be replaced with either a "x-tra-largasized" version of the Epsilon II chassis (Opel Insignia, 2011 Saab 9-5), a modified version of the Zeta chassis, or some kind of spin-off of the crossover Lambda chassis. Other people say the model(s) will be eliminated outright.
No real worries though, Buick will be adding two new cars to the US market in the next year or so. The Opel Insignia is due to show up as the Buick Regal in the next year or so, and a redone version of the Chevrolet Cruze as a "Skylark" shortly thereafter.
RE: Omnis
I agree on some of the style points. In all fairness, Buick has been doing those vents forever on their cars, even before they were "cool." Still, it looks funny to see it on some of their cars. Otherwise, the Lucerne needs to be updated badly, as it looks severely dated compared to the LaCrosse and Enclave. A shame really, because the design isn't more than a handful of years old (I think 2005?).