As for the season being boring it’s still too early to tell IMO, things can and do change in F1. It seems quite likely to me the two Mercs will end up taking each other out of at least one race.
I can’t see Audi (VAG) in F1 in the near future, the endurance racing and saloon cars is a much better fit for the brand. Mercedes have been trying to lose the dull tag for a long time, being seen as third best to BMW and Audi with their road cars in terms of performance. F1 does that for them after the link up with McClaren.
RD is a pretty smart operator, in a financially tight era they’ve hung on pretty well but its very feasible he’s written of 2014 and is focused on next year. Merc have their own team it’s not hard to imagine McClaren would want to go elsewhere.