There are reports prodrive may run a customer team next year.
I disagree that btcc was SEAT vs Vauxhall, the Bmws were always a threat this year, especially in the wet. I think SEAT realised that race goers aren't their market, the "sporty" Cupra model of the new shape has pretty much been a flop, theres hardly any on the roads compared to (say) Focus ST, Astra VXR, even the previously incarnation (Cupra R) of the leon was more successful. The people I see driving Leons are typically families with a diesel, who aren't interested, I also think the SEAT sport operation was probably looked down on by VAG who don't really seem to engage in motorsport at all.
I don't have any figures but I'd guess the Focus is a bigger seller than the Leon, the Astra must be somewhere up there too.
If Toyota don't perform in 2009 the thinking is they will leave F1 too. With regulations changing in BTCC, WRC, F1 in the last couple of years and into the future and with that goes variable costs its understandable why some companies are bowing out. Maybe when cost cutting measures and complete and legislation settles down some companies may be more interested in competing