IMO his model has reached its peak. We'll never win Europe with it.
What's his model? Go for security; high floor, lower ceilling. Sign experienced guys that will give you security of getting the job done decently well; but who will never explode or develop into cream of the top. I'm talking about Khedira, Matuidi, Higuain, maybe even Mandzukic.
We also have an Italian former basis - now reduced to Chiello and Buffon - that has its clear limitations.
I don't think he has to revolutionize it, but he surely needs to be more aggressive, gamble a bit more for quality and youth instead of keep looking for security.
Gotta do this so we can dream of Europe. With the current setup, I really think we've peaked.