Could one of those teams shifting focus be Merc as well?
Also, with the split turbo or whatever it was in the Merc engine providing the lion's share of the extra power, is it fair to say that Renault will go down that path and the power difference will be negligible (if any)?
I don't think you will see any "focus shifting" as 2015 will be 2014 with new noses (because FIA realised they made a mistake with the penis noses) and more optimised power units (which should improve packaging, reduce size of engine cover/sidepods).
The only teams, right now, I could see "focus shifting" are McLaren (because of Honda, and because, well, their car sucks) and Sauber. But even then, whatever breakthrough they make in 2014 should be carried over to the 2015 car without too much problems - again, because of their new PU, it might not be the case for McLaren.