You guys do realize about 13 of your 26 players are 30 or over the age of 30 right? Playing 2-3 games a week is asking a lot from them and this was bound to happen + you have no depth in the team. Sterling and Silva were being played down to the ground it was clear Sterling need a little rest from his last performances, as good as Silva is he's 31 and needs a game to rest as well not to mention you have 5 games from Sunderland to Liverpool in the span of 14 days. This season was always going to be transitional period, Pep has already showed a glimpse of what he can do and whats to come, there is a reason why everyone gets the hint that he may stay longer because he knows it'll take time, he won't be able to achieve everything in 3 years.
Relax a little.