I agree with AM3. Opel is struggling in Europa, because their production costs are high, but their cars are not as highly regarded as other german brands, so they can`t charge the same premium prices as BMW, Audi or even Volkswagen.
Opel is owned by General Motors, and their cars share many components with GM´s korean made cars, which used to be called Daevoo but have been relabeled Chevrolet. The Chevy Cruze is based on the same platform as the Astra, and the Chevy Sonic uses a new platform, which will also carry the next generation of Opel Corsa. And most of the Korean made Chevrolets use engines developed by Opel.
It makes little sence for a carmaker to compete with itself. And it makes even less sence to transport vehichles over large distances from a region with high building costs to a region with low building costs. And for that reason I don´t think we will see any further attempts to relaunch the Opel brand in Asean markets.