It's fine (and even a good idea) to do a heavy squad refresh after winning the treble.
I'm completely comfortable with letting Riyad, Laporte, cancelo, walker, gundo and Bernardo leave.
The only thing we seem to have forgotten that a refresh also requires.. a replacement! Why haven't we lined up a list of replacements months ago is beyond me. How are we just allowing them to inform us their desire to leave in mid July, with many potential replacements already gone. I don't get it.
Let's see how the window ends but for the first time this summer i am actually worried.