Will you listen to yourself and get a grip? In the first place, you're just basing your opinion on descriptions that you've read about Vidal. A 2-man midfield with Pirlo and the defense will get bumfcked. Second, what happens to this utopian midfield if Vidal gets injured and Juventus has games coming up against Milan and Inter, Pirlo-Marchisio and Pirlo-Pazienza? Third, there is no Vargas/Bastos... yet. Fourth, let's say a miracle occurs and Juventus finish in the top 3. Will you play a 2-man midfield with a 31 year old Pirlo in the champions league?
Keeping all this in mind,
why are you against adding a quality young central midfielder to the squad who can play well in 4-4-2 and 4-3-3, at a very reasonable price?