Even if Ozil and Sanchez stay which isn't looking likely we will have trouble convincing players of equal standing to them to join us. We won't pay there wages for a start.
We have been here so many times before with Wenger/Arsenal, statements such as "needing to keep this group together" actually mean "our best players want to leave us and I'm trying to convince them to stay". Adding only top top quality means "I want to add top class players to this team but only on my terms" I.E opportunist buys. Wenger isn't going to suddenly change, he can't and he won't, he's way too long in the tooth for that.
In my opinion, what happens now both on and off the pitch will not be a whole lot different to what we have seen over the past 10 years. Why should it be any different if the same methods are applied?