I think Mercedes have a better staff than McLaren have at the moment, more money and two better drivers.. But with a big rule change coming up next year, you'll want a stable driver line-up, someone with experience who can compare old vs. new for you, and that's even more important for 2015 when Honda will return to F1 in the back of the McLaren.
I hope Webber will enjoy his new career in the WEC/Le Mans, where there will be new rules too. Basically the only limit at Le Mans will be the amount of energy needed to complete one lap. Whether you want to do this with petrol, Diesel, electric, hybrid, jet engine or whatever is up to the constructor!
Another interesting rumor: Next year's F1 engines are well-suited for Le Mans too it seems, so we could perhaps see a return of Mercedes, Renault and even Ferrari to the 24 Hours....?