So you think that Man City who is already interested in new CB ,or Bayern Munich whose new coach is huge Silva fan won't try to sign him if he is available in the market?
Bayern have already spent 37M on Gotze, there might be some other changes they want to make too. Do they have enough budget to get Silva as well? City I guess are the other likely candidate if they want a new CB, Chelsea too. Silvas age might put them off though and they might want to go for someone younger. Also because Barca has a deficiency in defense Silva has more value to them so they are more likely to pay a premium. It would also depend on who Silva is willing to sign for, if he refuses offers from City and Chelsea then they become irrelevent.
I am not saying it's gonna happen, but it is a possibility. Times are changing, the transfer market dynamic is changing with big transfers becoming more normal. For a club that is hitting 500M in revenue 30, 40, even 50M isn't that big of an investment.