Considering A1GP's a dying series anyway due to admin incompetencies, late payments to teams and abandoned races, I think F1 in the winter has a much better chance of being more successful series.
The twilight races is a terrible idea, especially in Malaysia because it accelerates the chances of a race being stopped for good early on. Last weekend's race was the 5th time in 60 years of F1 that half points has been given out instead of the full whack because a race has been halted for good early (other times are Spain (Montjuich Park) 1975, Austria 1975, Monaco 1984 and Australia 1991). Even in the monsoons of Japan 1994 they did a 2-parter, but had the race been a couple of hours earlier in the day this weekend, they'd have done 56 laps and been wet on the podium.