Ok I'll start with the Toro Rosso boys. I think that there could be potential for them to move up to Red Bull, but let's be honest I think we can all see that they're no Vettel, when he was in the Toro Rosso you could see he was outperforming the car quite often. This just isn't clear with Buemi and Alguersuari especially with how they performed at the start of the year, when they both were fairly bad. Both aren't rookies now and their performances are both pretty similar, Jaime ahead on points but you'd have to say that probably more to do with his failings on Saturday which allows him to conserve more tyres. If I had to call it I'd say Buemi shades Alguersuari, but I couldn't choose one for the RB seat at the moment.
As for Webber he clearly won't ever get a real shot at the world title again. Just look at last year when he had consistently the fastest car with bulletproof reliability and a team mate who lost around 60 points through no fault of his own, possibly even more depending on how you apportion blame for Turkey 2010. All of this doesn't take into account the point increase that Webber recieved from Vettel's unreliability and yet he still finished 14 points behind Vettel, only 2 ahead of Hamilton who was in the 2nd/3rd best car and he had reliability problems (32 points lost) aswell.
However despite all of this he fits the bill perfectly for Red Bull. He's a known quantity, has enough speed to collect solid podiums but not enough to realistically challenge Vettel over the course of a season.