Not hard to replace?

Only time will tell how obnoxious such a statement is.
I'm not against selling Vidal (I'm obviously not thrilled about it), but the way we handled the situation, and how much we are getting for him screams desperation. Not to mention that the guy we are potentially replacing Vidal with is no established or accomplished star. Draxler has the potential, but will he realize it? That is another matter entirely.
Draxler isn't replacing Vidal. If that were the case, they would not be looking at Draxler at all.
You have two in house potential replacements for Vidal. One (Khedira) is locked in with his position as a midfielder. The other (Asamoah) is entirely dependent on getting another Left Back. Either one of them, or Pereyra, would be stepping in.
If Juve didn't have this kind of quality lying around after selling Vidal, then I would have lost my mind. But there is still quality there. Different characteristics than Vidal? Yes, absolutely. But we are seeing the beginning of what Allegri is looking for with the squad. More flair, less grinta. And its not as if the club is suddenly bereft of grinta because Vidal and Tevez left. Mandzukic, Lichtsteiner, Chiellini, Marchisio to a degree. It is still there.
Would I have liked to see a bidding war for Vidal? Certainly. But I find it very hard to believe that Marotta and the management would be so short sighted as to believe that no bidding war would have taken place if they placed him on the open market. There was something else at play here, and we may never know. But while it is easy to believe that Marotta didn't want to have a bidding war (for whatever reason), or that he should have made Vidal honor his contract (if that were the case, you would see far less transfers every year), then it is not far fetched to believe that Vidal and his people initiated contact with Bayern, reached agreement with them on a new contract, and then went to Juve to tell them of their intentions, and basically put Juve in a no win situation.
There were several suitors for Ogbonna. There are now several suitors for Llorente. If bidding wars are/were being done for those two, then why would one not be done for Vidal?
Unless the player and his people himself made the first move, and did all of this whilst still under contract with Juve.