So what do you offer? in order to play with 4 man defense and having both Tevez and Llorente, it's either 4-2-3-1 (Tevez behind Llorente) or 4-3-1-2 (we will get our ass kicked by any team with decent wings if we use that formation).
Well assuming we're talking about next Summer and not this moment in time, i'd happily go to 4-3-3 if one of our strikers aren't performing at a top level. At the end of the day, i'm not going to cry if Tevez or Llorente don't hold down a 1st team position after having something like 15 goal seasons or worse. (I'm not saying this will happen, but if it did)
If we get hold of 2 very good Wingers then we can prepare for life after Pirlo without smashing tens of millions on another Regista, and praying that they are even 1/5th as good as Pirlo. That doesn't seem logical to me at all. We NEED Pirlo so long as we have 2 wing-backs because he is our creative spark. 2 wingers/wide forwards sharing that creative burden between them could work well.
Most people agree that 3-5-2 has taken us as far as it can, so are Tevez and Llorente really good enough to build a team around, are they really going to be untouchable? I doubt it.
Neither of them are World Class and if the formation is holding us back, it doesn't make sense to stick to it just to play both of them together.