Hey, first post here.
I do agree with you, but I don't think it's a case of opting for the switch, it's a case of adapt or get left behind (imo).
We got a lot of stick last year for our defensive displays but I think most people would agree that you can't really build a winning side without having a solid defence that understand each other, how each other play and who will cover who when certain situations arise. Mancini, having drilled all this information in to each players head has basically just taken the break off, there were glimpses of the end product last year that those of us who watched every game, could see that was what he was working towards.
I just hope that AVB is given the time at Chelsea to implement his tactics, strategies and is given the backing of RA to rejuvenate what is an ageing squad with incompatible players for the system that he wants, but like Mancini, you can see what he wants the end product too be. A lot of teams are working towards the "finished product". Primarly being City, Chelsea, Arsenal and Liverpool. You can see what they want to do, but they aren't there just yet, all playing different systems that need tweaks here and there.
Anyway, I'm rambling and I need to get back to work!