toyota won't be up there....their testing times are far too slow at the moment to even challenge the middle runners, such as BAR and Sauber. At Silverstone, they were 7 seconds behind the Minardi time which was out of the 107% time. The engine is regarded as being reliable, but down on horsepower compared to the other teams.
As for threats to ferrari...Ferrari won't be up there for ever, and i think it will probably be someone other than McLaren that will bring them down. Williams will be strong again next year, and i think Jaguar will be a dark horse. The cosworth engine is very good, regarded as being top-3 in terms of technology and power, and when Rahal left Jaguar recently, i remember him saying that the new aero guys at Jaguar had designed a 'very good car'. Hopefully better than this year's chassis which has woeful aerodynamic efficiency. Next year will prove whether several teams are going to be contenders for the title in the future.