I think Red Bull's success was all about Adrian Newey. I don't think Vettel will bring much at all, as I don't think he's a good development driver. If someone builds a car that suits his style, he's quick. If not, he's out of the top five.
I think Ferrari will produce another average car next year. Without a top designer, that seems to be all they are capable of.
The last thing they should do is let Alonso go. They risk not making it into the top 5 of the Constructor's championship, of they do.
They've been warned...
JR