If we win the league and nothing else - is it a failure? - absolutely not.
In our first season under Pep's full control we've made exactly the right moves in the transfer windows to address our biggest weaknesses (full backs, goalie, CB) and have added an extremely talented midfielder (B. Silva).
Danilo wasn't first choice - but he's doing OK - about what we'd expect.
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As good as we are now, I think we'll continue to improve under Pep.
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I think we'll win the league (haha, bold prediction!) and the league cup - we're good enough to win the C/L - but so are several other sides (C/L is a crap shoot).
Meanwhile, we're playing exciting football and are by far the best side in the P/L; we've got the best manager in world football and our management is working closely with Pep to give him what he wants. What could be better?