This is when you realize that things have come the full circle, and folks are again underestimating the task as hand - as far as squad rebuilding goes. Yes, a change in the manager's position will go a long way - and the wider areas need some attention, but we're far off where we need to be in forward areas too. Might be ok in terms of numbers, but there's a distinct lack of quality - especially consistent quality wherein you can rely on someone who can score on a regular basis, in a way that allows you to make a push for the title.
None of our forwards have evidenced that - Martial is still developing, and it's arguable that his best position right now is as the left forward because it takes him out of the firing line. Rashford is similarly green, and might even be going through a purple patch (the media and fans are quick to build them up, only to later tear them down when their adrenaline base form eventually subsides). Rooney is done at the top level, and Wilson is probably behind Martial and Rashford in terms of end product. These are kids, and it's extremely risky to place such a heavy burden on them - even Messi had Eto'o and Ronaldinho and Henry around him when he was young, Ronaldo and Rooney had Scholes, van Nistelrooy, Giggs in attacking positions - to guide them, and currently we don't have those players to similarly shepherd Martial and co.
Of course, you don't need to have that caliber of support structure, but having someone who's a bridge (like Davids was for Barcelona - which allowed Xavi to blossom) might actually be quite beneficial for them.