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And with oil prices headed to $100/barrel next year (according to some oil industry experts, such as T. Boone Pickens), 400 hp V8 RWD coupes and sedans may be the last thing GM needs.

I agree. I think that there is a good chance that GMC, not Buick or Pontiac, will get future Theta derivatives, as well as Lambda minivans. In my opinion, GMC is currently the strongest brand of the three and will sell all of the trucks (except the Buick Lambda) for B/P/G. Wildcat won't like this, but I think Buick's sedans may end up being luxurious versions of Chevrolet's larger sedans. The LaCrosse may use the Malibu's platform, and the Lucerne may end up using the Impala's platform. If the next generation Impala is FWD (Chi), then so will be the Lucerne. If the next generation Impala is RWD (Zeta/Sigma), then so will be the Lucerne. Interestingly, the Automotive News article also addressed a next generation Grand Prix on either a new RWD platform or the Chi platform.