This is like the last VW bright idea, the W engine.

They made the W8 for the Passat but quickly dropped it. Frankly, it wasn't better than the Nissan V6 on paper. They also put it in the Phaeton, but there are less than 1000 Phaeton sold every year so maybe about 100 of them are the W12. And they are trying to put it in the Bugatti Veyron, which has been vaporware for years.

So all that research give you only hundreds of new w engines every year. It's not even worth it for the extra training expense you have to spend on the engineers and technicians.