No I would not be happy with Morata, Fabinho, Lindelof and Perisic.
If it happens, then I would predict us to finish 5th.
Whats your suggestion if you are unhappy with these 4?
Way I see it is
1) Lindelof is an upgrade at CB on Jones, Smalling, Rojo & Blind.
2) Fabinho can offer cover at RB but if signed would play DM, which would free Herrera and more importantly Pogba. More quality and depth in midfield which we have lacked for a long time
3) Perisic, while he is not Messi etc he will offer natural width on the left hand side. Bring more balance to the front line and avoiding us playing Martial/Rashford/Mata/Rooney etc on the wing as none are natural there.
4) Morata, we need a presence up top to replace Zlat. He's got a good record and could be good for 20-25 goals.
I admit there are possible alternatives to these players, but I can see the logic in obtaining a player in each of these positions.
The end game is a better team balance, and if we signed these 4 in particular (unsure if we will or not, but lets say we do for arguments sake) then the shape of the squad would be better than it is now, that much I don't think you can argue with.
Could add another midfielder for further competition for places. I think Morata 1st choice striker, with Rashford/Martial as back up is strong and perisic may well surprise the doubters