Nah, I'd say that if everybody was fit.
Actually, the first step is dropping Busquets and shifting FDJ to that role. FDJ, Arthur, Vidal/Raki is a solid CL midfield. Press resistant, somewhat dynamic, young and with legs.
Defense can be a worry but Pique has the ability to play up to occasion. Alba, Pique, Lenglet, Semedo is a decent defense. On the softer side but not a total trainwreck either.
Attack is where my concerns are. Suarez despite his lack of production in CL is a big miss. Messi's shooting form is also concerning. Here, we need Griezo to really step it up and for Fati to play 2-3 years ahead of the curve.
But look at our competition. RM have an aging Benz, injured/off-form Hazard, and Bale in attack. Juve have Dybala and CR7 but a terrible midfield/fullbacks. PSG's midfield and defense is a shambles and they're going out R of 16 anyways. City has a back 4 of clowns. Dinosaur DM and crap attack.