To get the fans to believe again? Seriously, these signings are OK, but nothing really special. Losing Cesc replace him with Rakitic, does that really makes us better? Losing Valdes replace him with ter Stegen, Lose Alves, replace him with Marquinhos? Lose Sanchez, replace him with most likely Cuadrado?
I don't see how the team is stronger? More like the same or maybe slightly downgraded, IMO.
I understand where you're coming from, but for example ter Stegen is an ideal signing for Barca, Rakitic is also very good considering Cesc's inconstant form, the rest we don't really know if they'll ultimately be joining, but remember that even though they're not hyped by everyone, most of them are really good signing (some of which we will see just how good they are during the World Cup, and I think most will be surprised).
Don't also forget that we already have a starting core (so these additions will be to add rotation or depth) and that Enrique has the final calls on transfers and knows how he wants the team to play and who he wants to play. And if the transfers he got in Roma indicate anything, it's that he has an eye for unknown class players. But even historically, Barca have only made marquee signings every 2 years or so (not every year) and with the style of play who's to say they won't be able to adapt (quickly)?
I don't also know if we are still getting Marquinhos or who we are actually getting - we might as well be trying to get Benatia and no one would know considering how unreliable the media is.
And here's what I see Lucho doing (don't know for a certainty), I see him wanting to trust the youngsters like Pep did with Busquets, and gradually playing Xavi less and less and Roberto and Rafinha more. Same with Deulofeu, so one of Alexis or Pedro will leave, but that depends on who he thinks will work well in his system of play.
And I don't want people to be complaining next year that Barca always go for overhyped when they should do some scouting, which they are doing just fine now. So ultimately we don't need a marquee signing this year. We need a strong team.