I think we will either win or be second in the league and get to either the semi finals or the final of the CL. The domestic cups are a lottery but I think we will either retain or at least get to the final of the League cup.
The reason we got knocked out of the CL is because Liverpool were so close in the league. If we had been 15 points ahead (as we were the season before) we could have eased up in the league the week before the Spurs games and still had a lead to spare in the league. Because we had no margin for error in the league we had to play our strongest team and rotate in the champions league. It was almost enough, but not quite.
We got through to April still in with a chance of four trophies because of the depth of our squad. We had some favourable draws in both cup competitions which meant that we could rotate more without real danger, but even then we almost slipped up against Swansea. I'd back us to retain the League Cup (or be beaten in the final) because we consistently put out stronger teams than our opposition in that tournament. In the FA cup I think its more likely that we go out somewhere along the line.
We won't end the season without a trophy, we may pick up two or even three but for a quadruple all the lucky breaks need to go your way. The injuries, the opposition's injuries, the draws in the cup, the VAR decisions, everything. I just don't think that it ever will.